This from MTV’s splashpage...
“I think it’s just one scene that they’re gonna have to reshoot and it’s the end fight,” Chung said of what they were re-tooling. “I fortunately will not have to go back. I think it’s the big fight between Justin Chatwin (Goku) and James Marsters (Piccolo).”
As for sequel talk...
“We’re signed on for two more,” she said. “Hopefully, I hope the movie does well. There’s lots of places that Fox wants to go with this.”
Get the whole article, and the Japanese meaning behind her character's name, "Boobs", at the source link.