A recent Reddit Post summed up what is known so far. Not my post, words, or typos. Helped me get caught up.
Chewbacca
His bowcaster behaves differently to the starcard
His trait will improve the way his bowcaster fires
Roar ability will benefit his team mates
The bolts from his bowcaster can be doubled with ability
Close range physical ability
Bossk
His Relby will have an infrared sight
His trait will regenerate his HP
Jump ability will allow him to get out of dangerous zone leaving a dioxis cloud behind
R2D2
Fully controllable, cant jump
Support character
He can stun enemies at short distance
Scanning ability
Lukes Red Five
R2D2 on board, regenerates HP
Biggs and Wedge are his escorts
It will be fairly similar to a regular X Wing
Vaders Tie Advance
2 Imperial Ace escorts
Its a hybrid of the TIE Fighter and TIE Interceptor with some specific Vader abilities.
Similar ability to the new TIE Interceptors laser barrage
GAME MODES
Battle Station
Could be at least 30 minutes long
At some point there will be an asteroid field (host talked over Dennis a lot)
1st phase: Rebels need to destroy TIE fighters until Y wings come in to weaken Star Destroyer defenses so it can be taken down. Imperial players along with AI ships will be set up to defend it.
2nd phase: Rebels have to locate and rescue R2D2 from the Death Star. Bossk and Chewie will be playable here. Close quarters infantry combat. Iconic locations from the movie will be present.
3rd phase: Rebels attempt to blow the Death Star doing the trench run. Both new hero ships will be playable here along the Millenium Falcon.
Heroes vs Villains will be included in th Death Star DLC
BUFFS-NERFS
Blasters and star cards - Disruption is getting nerfed - Possible buff to RT97-c - Bacta cloud will give extra HP over time not instantly - Taking damage will stop bonus health ticks
Heroes - Hans shoulder charge wont work in the air now - Leia is getting a small buff - Landos power blast will not be fixed
Fighters - Speed boost is now faster and has a lower cool down - A wings shields will be replaced by a speed boost - Tie Intercepors ion missile will be replaced by an anti-shield laser barrage - TIEs speed boost is now faster and has a lower cooldown - Soft lock on will have a cool down
NEW WEAPONS GADGETS
1 blaster is semi auto and 1 full auto
No grenades will be added although new gadgets will cause explosions
MISCELLANEOUS
Trait system will be tweaked
DLC playlist experience might be improved
Palps block ability will remain the same with this patch
Stinger pistol will be buffed in another patch
Frames rates will be better on most PCs in multi hero scenarios
Did they delete the tweet?
Sorry, not sure why it didn't work for you but Nemic had you covered.