These threads keep getting made because the old ones die out when there isn't constant news... I'm sure more will be made before the game comes out lol
Current roster:
Sub, Scorp, Kitana, Reptile, Lao, Goro, Ermac, D'Vorah, F/T, Quan , Raiden, Kano, Kotal, Cassie
(9 returning, 4 new)
Unconfirmed returning:
Mileena, Liu, Jax, Sonya
(4 more returning for a total of 13 with 4 new)
After playing through Story Mode again, I am 100% positive that Shinnok will return.
(1 more returning = 14, 4 new)
Boon's tweets about Jacks imply that Jax or Jacqui (or both) will be in.
(1 more returning and 1 more new = 15, 5)
Deadly Alliance had 10 completely new characters introduced (not counting Moloch... Sareena doesn't count in GBA TE) and Boon said that this one will have more than any other game. For this to be true, there will have to be at least 11 new characters, so 6 more are needed. This makes the roster 26 and I'm sure it will be larger than that.