Lol. I can't believe I didn't know about that before. This hurts Mewtwo's chances
It hurts but can also strengthen his chances too. There's a Mario trophy in his Mario Strikers uniform with the ball, to my knowledge. There is also a trophy of Toon Link in his more casual attire before aquiring the garments of the hero.
In this trophy, Mewtwo has particles of what look to be debris (I could be wrong) floating about him. Now, every trophy that we've seen SO far of the Brawl designs for characters don't have anything extra of special to them. Even Lucario doesn't have the aura glow about it's hands like it does when in-game fighting.
I may be grasping at straws here, but it's possible that Mewtwo's classic trophy has no little debris about him to emphasize on his epic Psychic powers, and may just be of him only. The All-Star one would obviously be of his Final Smash.
And in my opinion, the Trophy of Mewtwo that we're seeing now doesn't look up to date when it comes to graphics of the playable Brawl characters.
Personally I'm inclined to believe Roy and Mewtwo's appearance in Brawl. But if it's false, then there's still nothing stopping this from being a fantastic game. ^^