Dragonball-Live has a scan from Cine Live, a French Magazine, in which James Wong reveals certain details about Dragonball! Including an interesting bit about Roshi.
Is Roshi true to the manga character? “Yes, somewhat,” said director James Wong. “We kept his main features, like his humor. But in the manga Roshi is a true sexual pervert, which wouldn’t work in a family film. So we removed that part of the character.”
“I discovered that Dragonball had such a rich universe that it would take several films to cover all of its treasures. My goal with this movie is not to convince existing fans that Dragonball is great, they already know this, but to give a new audience. More adults, as I was a neophyte myself before discovering the manga!”
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What is most interesting is that this interview may confirm possible spoilers that you all have probably been reading over at IMDB. A user there claims to have seen the film already and mentioned the same thing about Roshi.