While the character roster for Tatsunoko vs Capcom was supposedly completely revealed it might look like a couple more characters might squeeze in before release.
A Capcom representative at a event for Tatsunoko vs. Capcom commented on the build of the game they were playing, saying “There’s all the new characters and there’s some secret characters we haven’t revealed yet.” Seth Killian was later asked about the comment and he said “That’s still a secret and you won’t be finding out until a few weeks”
The quotes comes from a forum user on Capcom’s Unity blog that was covering the event, so this has just been marked as a rumor for now. You can check out his post here.
Update: Yatterman-2 announced (I thought she was already actually, but I guess i was wrong), you can check it out over at Gamespot (footage at 8:50 mark).Still the rumor says “Characters” with an S, so i wouldn’t consider more characters out of the question yet.