Well, I strip mined
the official site, in response to this topic, and I can indeed confirm that Sonic is in it, though I haven't seen anything with him talking, so I cannot confirm that. The only stuff shown of Bowser indeed has him grunting and stuff, but that doesn't completely disprove that he talks. I am amazed (though in this day and age of Sega not in hardware and crossovers like Smash Bros. more common than any of us could have dreamed 10-20 years ago, not that amazed) that so many companies have signed on to this. I saw a preview for it while watching another movie 6 months ago, or so, and I am amazingly excited to see more info. Now, if I could just get an in on some press stuff, I could pass out happy from fanboy overload.
EDIT: I just watched the trailer again, and it clearly shows Bowser mouthing while the whole group says the "Bad Guy Affirmation", indicating that he at least is correctly portrayed as being able to speak. Whether he actually has a line in the movie to himself is another question, unfortunately, but he is indeed
capable of it.
Lovethismoviewannaseeitwannaseeitwannaseeit!!!