Well this is the japanese Jump magazine, and they show Goku blue gi
more picts here
Exclusive: Jump SQ August Issue | Dragonball - The Movie

Translations courtesy of dbthemovie.com
Justin Chatwin (Goku)
I am very honored to be able to play Goku. When I am playing gentle and loving Goku, I feel as if I am given energy from him. In the movie, I have a lot of great action scenes. After the movie is finished post production, I’ll get to see my Kamehameha appear on the screen, and I get very excited when I imagine that.
Chow Yun-Fat (Master Roshi)
On my career as an actor, it is my first time to play a manga character. Dragonball is read all over the world, have many hard core fans. I hope they won’t be disappointed by my acting (laugh). But to be honest with you, I’m totally satisfied with my performance as Master Roshi.
Emmy Rossum (Bulma)
It is a very exciting thing for me to play Bulma, because I’m a big fan of her myself. She’s intelligent, motivated and has a short temper like a teenager. I really want to make all the fans of her happy.
Joon Park (Yamcha)
I like Dragonball very much because I read it when I was child, so when I got to audition I begged the director to “Please give me any small part, like a man carrying sandbags behind the screen.” (laugh) Furthermore, there is Chow Yun-Fat who is my hero from when I was child. This is a dream role for me