MKX characters I'm most confident won't return:
Every DLC character (Alien, Bo Rai Cho, Goro, Jason, Leatherface, Predator, Tanya, Tremor, Triborg)
Ferra Torr
Shinnok
Quan Chi
I'd love to be proven wrong about Tanya (very fun character to play!), but somehow it seems unlikely.
Mileena, on the...