Supposed Kabal was probably the most excited part of the trailer for me, but looks like he RIP to Liu Kang's dragon. Similar to what is seemingly Reptile, or a person of his race, getting his heart ripped out by Kano. I honestly wouldn't mind if a lot of the characters in the franchise end up being fodder cameos with some reasonability.
As far as Kano standing with the good guys, I feel like its trying to set up a betrayal twist.. esp if Kabal is in it. It'd be hard to imagine them not trying to include some reference to Black Dragon with those two.. and it would be a weird liberty to take out the Kano obsessions' over Sonya. Buuut inb4 they thought it was a good idea to mesh Cage and Kano as the comic relief.