New interview
http://www.gameinformer.com/b/features/archive/2017/06/16/bandai-namco-on-why-a-2d-fighting-game-was-the-right-choice-for-dragon-ball.aspx
Of the six characters in the demo, who are you most excited about? Which character are you hoping makes the cut?
>My character out of the six we’ve revealed so far is Majin Buu. He’s quite unique and technical. You can probably tell that he’s not moving that fast because he’s like the heavy-type character, but he’s got a long reach. For example, his arm stretch out, or he can take a part of his body and throw it at the opponent, so he’s unique in that way. For the characters we’re looking forward to in the future, we obviously can’t say specific character names, but we would rather say that the characters that we’ve revealed so far are quite standard, but we can definitely tell you that the characters in the future are going to be more unique.
We aren't getting SSJ transformations as separate characters thankfully.