I'm going to say something crazy, but for some reason I can feel it...
What if that's a resurrected Stryker and Kabal? Clearly they've been through some shit. Dude on the right looks a lot like pre-burn Kabal in the face, and Kabal has always had long hair.
As for "why is Kabal not burnt up then" clearly the resurrected characters have ha their wounds healed, seeing as how Kuai is no longer half machine and Lao and Kitana look good as new.
"Kabal" has a costume that is very in line with the second boot in the infamous boot tweet: