For this game, I think he's going to be balanced enough. But if you're liking BTL, then 100% and perhaps Mecha will be there as seperate forms.
Either way, since frieza has many transformations, he'll be one of the stronger characters in the game already due to power multipliers (unless they were greatly reduced). Frieza's not gonna be gimp or anything.
Besides, you can always use an unofficial 100% model someone's gonna make probably.