I don't get why they'd tease Kabal at the end of the reveal stream just to shoehorn him in at the end, but okay.
They're probably gonna show a Kabal reveal trailer (maybe throw in another character, maybe Kano), then they'll go into his moves and stuff like they do for every kombat kast (and if they surprise show a second character maybe they'll go over their moveset as well). Then maybe at the end they'll tease someone else and announce the date for the next stream.
Don't get too ahead of yourselves cause we still got 11 weeks until the game comes out and they're sure as hell not revealing the whole roster today.
Chat > Reveal Trailer > Gameplay Demonstration > Kirtzic V. Lansdown Battle for the Whatever > Tease for the Next Stream. Then we gotta get ready for the Xbox stream which, hopefully, will have a reveal trailer for a character as well.