So all the new info from the stream:
Quitality was shown for people that rage quite online, their heads explode and you take the win.
Mileena, Kung Jin and Takeda where shown, all 3 variations, X-rays and fatalities where shown.
Goro was on the select screen.
They said that Jason is nowhere near complete and will only be worked on when the game is completed as he is DLC.
It also looks like MS let slip the existence of Predator on the Live store:
Bundle Description:The Kombat Pack is currently available in the Mortal Kombat X Premium Edition on the Xbox Store. Kombat Pack grants early access to 4 new playable characters and skin packs. Stalk and slash your opponents as Horror Icon Jason Voorhees, or play as Predator, the Ultimate Hunter. Two Klassic Mortal Kombat characters complete the offer. Each playable character comes with a themed skin pack including three new skins for select characters. Also includes The Samurai Pack available on April 14th2015.
Mileena looks so sick, can't wait to play with her.
Mileena Fatality:
http://fat.gfycat.com/SelfreliantCoolAustralianfreshwatercrocodile.webm
Takeda Fatality
http://fat.gfycat.com/IdleGlaringIriomotecat.webm