The one about the Showcase, but not the TWID, cause I'm not around.

Showcase Recap

Inside the portal is the Traveler's Pale Heart (new zone)
Witness is trying to fuse the light and darkness to freeze the universe into perfection
Pale Heart seems like a trippy combination of past locations and your memories twisted by the traveler
One of those destinations in the Pale Heart is the old tower, but in a last of us post apocalyptic style
As you get closer to the Witness's monolith, the terrain gets more dissected/ominous looking
New Tormentor type enemy called Subjugators
Campaign reunites the vanguard team
Pale Heart is linear at first, and expands out after Campaign
Could give it a bit more of a dreaming city like experience, hopefully
Raid is the final "Mission" of the campaign story wise: witness confirmed as boss
Cayde-6 is back of course
He "needed" to come back for the story to support the Pale Heart's function supposedly

Warlock solar super is a callback to Radiant warlock in D1 (FPS super) w/ powered up grenades and melees
Will not include self rez
Gives scorch to solar weapons for you and nearby allies
New aspect has a solar buddy
Titan has a void ranged burst super
Tosses 3 axes that suck in enemies and blows them up
Teammates and Titan can grab axes after thrown
New aspect allows you to consume grenade to do a mini kamama blast
Hunter arc super tosses a knife and slams into where it lands (3 total knives)
New aspect creates a in-the-air whirlwind teleport thing with the arc staff as well

Tessellation is an exotic pyramid fusion rifle that can run any element including strand and stasis in the energy slot
Tessellation can load your grenade into it to create a super projectile
Tessellation confirmed as preorder bonus
There is a golden gun like sniper and a traveler based exotic as well
Khovostov, dragons breath, and red death returning!!!
Red Death is a solar weapon and is the season pass weapon
Rocket pistol side arm is a new archetype for sidearms
There is a new support frame auto rifle that switches from firing bullets to firing healing bullets

Strange Coins (earned through ritual playlists) returning to bring back "excitement" to Xur
HUD being rebuilt to make status effects more readable

Eris Mourn focused, w/ lucent hive
Immaru will help us revive Savathun if we defeat Xivu
Savathun's Spire is the new 3 player activity
Additional 3 player activity, with tier elements like Blinding Well & Court of Oryx
We wield hive magic to assault Savathun's Spire to tithe to Hive God Eris
New card activity that allows build crafting through deck building
The cards can be used to make a deck for use in both activities
New Vex network PvP map

Glowing armor from the Ages of Triumph raid confirmed!!!!!
Nothing brand new shown, but Bungie is dialing up difficulty to test limits for Final Shape raid

Simplifying power structure
Certain activities will be power fixed, with difficulty tiers
Nightfalls and Raids will still use power levels
Fireteam power is a new system that will adjust everyones power to 5 below highest level player
Makes activities less gate keepy
Trials will also remain power enabled, Bungie might test Fireteam Power on it

Episodes are the new story structure after Final Shape
There are 3 next year: Echoes, Revenant, and Heresy
This replaces the 4 season structure
Each one will have 3 Acts with unique story missions and activities
Story wise, they are less connected to the order you play each episode
Act 1 having 100 rank season pass, and Acts 2 & 3 adding 50 additional ranks each
They are adding more rewards to the track, and more unique rewards from level 100 to 200
Act 1 will have an Artifact, Act 2 & 3 will add mods to that same Artifact