If they don't make Daisy her own character, simply relegating her to a cameo as an alternate Peach costume, if they make multi-taunts I so hope that they put in Daisy's voice for that costume.
Fanciful thinking? Yes, very much so on my part, but her voice is SO GODLY. ANNOYING. If you haven't heard Daisy from Double Dash, you need to. And that's why I used her and Wario for a team for so long - she's so freakin' fun to taunt with, and Wario just because he's cool. (And I prefer the heavier carts to the lighter carts - Boo Pipes FTW)