(...shamelessly copy and pasted from reddit...1,2,3)

Destiny 2: Into the Light Developer Livestream #1 | VidLink

INTO THE LIGHT launches weekly reset April 9th [Note: That's this weeks forthcoming reset]

• Hoarde mode confirmed. Onslaught
  
• Legend difficulty confirmed
  
• Tripwires, turrets confirmed.
  
• Wave 1 to 50 mentioned
  
• No matter the difficulty, losing it all and it will fail. Defensive game mode, not offensive
  
• Will be found in the Last City
  
• Witness doing all it can to stop us closing it down
  
• Shaxx is opening up his Arsenal (hear more next week) and is the vendor
  
• Gameplay shown during livestream
  
• Onslaught is 3 player fireteam based. Matchmaking. (not confirmed for higher difficulties)
  
• Build crafters should be on notice
  
• Fallen enemy shown.
  
• Killing enemies grant scrap which can be spent on defenses
  
• Shaxx’s Redjacks will be there to help
  
• MIDNIGHT COUP CONFIRMED
  
• Lore point is that because we assault the Witness, earth is undefended so building this is essential to defend the Last City
  
• Lots of weapon information starting next week (Lots of new Lore attached)
  
• High Value Targets shown with Champions dropping materials and augments
  
• Onslaught map is PvP map Midtown with new decorations
  
• Defenses can be upgraded to be stronger. Tripmines and Turrets. Do more damage, health, fire rate
  
• Bonus objectives appear. One seen is complete wave in X amount of time. Rewards include heavy ammo crates. Bonuses scale with difficulty as you go further on
  
• Playlist version of Onslaught, 10 waves. Challenge version is 5 sets of 10 waves and you move around 3 different locations around the map
  
• Bosses confirmed in Challenge version (Basically after every 10 waves)
  
• One location is taking the fight to a Pyramid ship and dunking a spark like Rift
  
• 10 wave version is Onslaught playlist. Quick and easy going fun
  
• Upgrades increase in cost (Scrap) so choose upgrades wisely
  
• Throwing batteries at main ADU gives it health. Like Black Armory forges and rewards scrap. Don’t let enemies in the zone
  
• Boss in Pyramid taking fight to the Witness
  
• Has augments to help deal with bosses
  
• Playlist is matchmaking / fireteam. Challenge mode normal is matchmade, legend challenge pre-made (Says needs to confirm). Fireteam Finder on hand
  
• Hive shown. Hive, Fallen and Taken will be involved
  
• More weapons to be revealed next week
  
• Shaxx will be announcing during the mode to push us on
  
• Max level for defenses is 3
  
• If defense is destroyed, It will need to be re-bought and leveled
  
• Scrap is player based, not Fireteam
  
• 12K Scrap total to fully upgrade Turret
  
• Up to wave 20 on stream
  
• Every time you clear a boss; your previous defenses will remain. So if you move location they will remain at the last location but cannot be upgraded again until it’s the defense point
  
• Every 10 waves you get a chest. Challenge you’ll get 2 chests. Hard mode, additional rewards and double (Some surprises along the way)
  
• Possible variants to rewards
  
• Revives - on until you progress in challenge to a certain point which will turn into darkness zone and modifiers will also be added the further you go
  
• Can’t gift scrap. You can upgrade defenses other players place or upgrade first
  
• ‘Onslaught and chill’ will be great for catalysts, triumphs and bounties
  
• Bungie challenges the community do complete legend all 50 waves solo
  
• No timer. Only fail condition is to lose the defense
  
• Lore wise - Weapons Shaxx has been keeping. Ones that are frowned upon in the Crucible. Revealed next week
  
• Light level set to current level
  
• Hung Jury came up as a reward
  
• Midnight Coup was shown to hold Firefly and Kinetic Tremors perk combination
  
• Less boss immune mechanics and more buffs to take them on
  
• Onslaught will be on multiple maps
  
• New rep rewarded called ‘Hype’
  
• New Social Space mentioned

Destiny 2: Into the Light Developer Livestream #2 | VidLink

Misc:

• Rocket Jumping w Mountaintop!
  
• Confirmed 100 more vault slots with Final Shape :)

Social Space:

• Backstage - featuring holiday event structures & decorations
  
• Hall of Champions - level up Shaxx's Hype rank to unlock chests
  
• Shaxx & Arcite - left chest is for redeeming trophies with Shaxx & earning weapons, right chest is the returning 'Gift of Thundergods' to help anyone catch up on power levels
  
• Attunement - interact with a Shaxx hologram to increase the drop rate of the chosen weapon
  
• Symbiote behind Shaxx - obtain keys to unlock the Superblack shader

Vendors:

• Shaxx Inventory - featuring D1 Superblack shader rank unlock
  
• Arcite Quests for Returning weapons - complete quests to earn a curated roll & unlock the weapon in your loot pool

Armour:

• Hunter set - inspired by D2Y1
  
• Superblack shader from D1 returning

Weapons:

• Mountaintop
  
• Recluse - Master of Arms is 15% down from 20%
  
• Edge Transit - featuring Cascade Point on the left column
  
• Falling Guillotine - featuring Eager Edge
  
• Hammerhead - featuring Rampage & Killing Tally at the same time!
  
• Blast Furnace
  
• Succession - available without doing Deep Stone Crypt raid
  
• Midnight Coup
  
• Luna's Howl - changed to 140rpm but still Precision frame
  
• Forbearance - featuring Disruption Break on the left column. Available without doing Vow of the Disciple raid
  
• Hung Jury
  
• Elsie's Rifle

New Perk Descriptions:

• Indomitability origin trait: Final blows grant grenade energy when playing a Light subclass or melee energy when playing a Darkness subclass.
  
• Last Stand perk: Weapon final blows grant bonus damage (apparently 20%). Melee and grenade final blows grant a larger damage bonus that can stack.
  
• Reworked Magnificent Howl: The number of precision final blows before reloading affects the total rounds granted with increased range and damage. Precision final blows with Magnificent Howl active extend the effect for additional rounds.

Destiny 2: Into the Light Developer Livestream #2 | VidLink

These are all notes taken from the third and final Bungie livestream leading to Into the Light. You can watch a replay of the full stream over on Bungie’s channels

If I missed any juice, please feel free to let me know and I’ll add it in

Live updates of the Destiny Into the Light stream, launches April 9th

INTO THE LIGHT STREAM 3

• All Brave weapons to be made available by April 30th
  
• Whisper and Zero Hour confirmed
  
• Originally Bungie made Whisper to add layers of secrets to the game
  
• Bungie showing original concept art of Whisper
  
• Idea was to have great tests and be rewarded with great power
  
• Wanted to create mystery vibe and dread while playing
  
• Wanted it to resonate with hardcore players who can then take others through the mission
  
• Speaking about the ‘green room’ and reactions from testers
  
• Have added additional tuning and enemies to encounters to match sandbox
  
• Access to Whisper has changed
  
• Remember the Public Event access
  
• Eris Morn appears to be the access to Whisper, no longer a Public Event access
  
• Goal of the team was make sure to change things to keep Whisper fresh and exciting for new players and Veterans of the mission
  
• All old guides are obsolete
  
• Chests have moved as well as the routes and surprises
  
• Bungie excited about the new Boss fight
  
• Tr3vor was inspired by Takeshis Castle
  
• Concept art of Tr3vor and what it developed from
  
• Bungie talking about how they made Tr3vor scary and how they could scare Guardians after all we’ve done
  
• inspired by Bungie devs own fears
  
• Speaking about how they’ve changed the encounters to fit the current sandbox
  
• New combatants added to make missions more challenging
  
• Enemy density increased
  
• Missions still feel the same even with changes
  
• Speaking on how to make these encounters feel good again
  
• Proud of boss fights but not showing them letting us discover them
  
• Bungie let Guardians at Guardian Con decide on what Tr3vor meant
  
• Whisper is craftable
  
• Outbreak is craftable
  
• Both weapons will have Stock options
  
• Max Stability Whisper possible
  
• Whisper shown to have Mulligan, No Distractions, Enlightened action, Field Prep
  
• Whisper from 18 to 24 in reserves
  
• Will take 3 weeks to unlock all works. Catalysts are retroactive so if you already have them they can be used again
  
• Whisper comes back with Into the Light, Zero Hour launches in May
  
• Ships returning but are updated to look new
  
• Zero Hour ship to look inspired by Outbreak
  
• Whisper ship looks different and is a different asset so players who have old ships can say they were there for the OG missions
  
• PVP maps to be shown now
  
• Bungie have ensured the PvP strike team are the best designers for the job
  
• Trying to create places for players to use all their tools
  
• Maps are focused on competitive game play experiences and work for 3v3
  
• Wanted to breathe new life into the higher and sweatier players
  
• Bungie want the maps to help players express themselves and balancing it with a satisfying engagement with the map itself
  
• They want players to understand the map and now curse the map itself. Understand how the play to play works
  
• First map is called Eventide labs on Europa. A forgotten lab
  
• Designed to include Lore and a presence of Fallen
  
• Wanted to make sure these places didn’t feel familiar and wanted that new feel
  
• Talking about long Range spots on this map and showing some important spots on the map
  
• Next map on Neomuna, Cirrus Plaza
  
• Map is balanced to be risk / reward and players can use it to their advantage
  
• Speaking about the 'clean zone'
  
• Talking about the process of map layout and base it on Control as a base point to build around
  
• Final map is on a Pyramid Ship hit by the Traveler
  
• Map called Dissonance
  
• Bungie had to clean up the map as the environments have lots of designs that cause shadows and geometry that can interrupt the play like visual noise
  
• Maps show that looks to have some wide open spaces and long sight lines
  
• Maps tested by external testers for 2 days
  
• Feedback wasn't easy to hear after thinking map was close but took it all onboard and was a valuable listen in what they don't see
  
• Testers were taken from the Community and Bungie was really happy with the experience
  
• Excited to see how the meta forms in the wild and watching what happens on each map in regular PvP and Trials
  
• Launch May 7th and will have a 3v3 in its own playlist
  
• On April 30th Bungie will release the Raid Boss Gauntlet
  
• Face raid bosses with escalating difficulties, challenges and rewards
  
• More info to be released in the coming weeks
  
• New Seal / Title for Into the Light, BRAVE
  
• Skip New Light option will come in, 'New Light kits' given
  
• Barrier to entry has never been lower
  
• Can change Guardian looks will arrive with Into the Light
  
• Name change coming with Into the Light, one token to change
  
• Next week, Developer gameplay preview of The Final Shape. Twitch drops will be LIVE. 15 mins of view time
  
• Into the Light emblems available too

- - -

Note also that a fair bit of this has also been mentioned in recent TWABS (1,2,3).