Komfirmed Kombatants (oy) so far are:
Scorpion (Likely Hanzo)
Sub-zero (Hard to tell if Bi-Han or Kuai Liang. Likely the latter since he and Scorpion don’t seem to hate each other)
Kung Lao (Can’t tell if he’s Great Kung Lao)
Raiden (human, but still has lightning powers)
I think it was confirmed that some kombatants are assist only kharacters, so not all of them are fully playable.