So the top one there is likely Link (unless there is a Zelda one too - since Zelda is associated with purple). Then the other page likely has her original costume (unless that's the thing in the middle). And I have a funny feeling that her Bayonetta 2 costume will be accessible.
As much as I want a Rosalina costume (it'd be the only one I'd use, provided it's good enough), I have a feeling it won't be done, due to Bayonetta being such blatant sex appeal. A lot of Rosalina fans are kind of prudes about Rosalina being portrayed in any sort of sexual light. While you wouldn't be actually playing as Rosalina, I think people would not like it since she's supposed to be portrayed as more elegant and stuff. Peach has been portrayed with sex appeal in the past, as have the other women, so it makes sense for them.
So yeah, as much as I want a Rosalina costume (complete with a lovely wig), I am not getting my hopes up.
I still really want that game though, and I'll likely use the Peach costume if there is no Rosalina, because DEMON BOWSER LIMBS.