According to Namco Bandai's press release, the Wii platformer, now called Dragon Ball: Revenge of King Piccolo, will also include a versus mode, meaning that almost two new Dragon Ball fighting games were announced. Neither Namco Bandai nor Atari have announced any North American plans for any of these games, but it's only a matter of time.
[Screens via Nintendo Everything]
Source -- Dragon Ball: Revenge of King Piccolo
Source -- Dragon Ball Z: Attack of the Saiyans
Source -- Dragon Ball Z: Raging Blast