Yeah...that must be old news...or a rumor. Goku is going to be played by Justin Chatwin (Tom Cruise's son in War of the Worlds), Piccolo=James Marsters
(Spike from Buffy the Vamoire Slayer), Bulma=Emmy Rossum (Christine in Phantom of the Opera).
:x Here's a website with some info. I think I'm going to be sad after seeing the movie...:(