Too early for me to have a final set of guys I will use. I have to actually play the game to answer this, but from the looks of things I plan on maining or at least secondary Raiden and Scorp. I will TRY out Cassie because she looks like she's going to be an annoying zoner with her guns and she looks like the wiseass character lol(not surprising given her parents)
I have no interest what so ever in Goro or Ferra/Torr or K. Kahn. All look slow as hell. I'm sure they'll be good up close but they don't fit my style at all.
Sub-Zero and D'Vorah I'll probably mess around with but don't plan on maining them. I also want to go after the lesser used characters.
I'm still hopeful Ermac, Fujin will be announced if so they will be my one, two punch then Raiden and Scorp. Unless Sektor gets back then he'll be my second guy again. If say for some reason Ermac, Fujin and Sektor don't make it then I will most likely use Scorp, Raiden, Kano, and Cassie a lot. MAYBE Quan Chi, I don't know yet. I like QC's second style especially and first, but if he's going to be used by a lot of players I'm not using him. I know they're going to reveal that nasty, annoying pure turtling and zoning guy)so far clearly Raiden and QC seem to be among the top zoning guys). Whoever that is hope it's Ermac, Fujin or Sektor I'm maining them.
But as of now with these released characters, I plan on using Raiden, Scorpion, Kano, Cassie and Quan-Chi. I'm sure this list will change a bit once the games whole roster is revealed.