Quoted for truth.
In ancient lore, Dragons were actually the spawn of Hell, even comparable to demons, which explained thier fire breath: the opening of they're mouths would summon hellfire upon all the dragon's foes.*
But, modern day Dragons are far from anything you'd find from Hell. "Dragon Tales" stands as proof more than anything for this conversion to the light side for dragons. And Yoshi's utilization of "angel" wings, as opposed to the more classical "serpentine" ones, serves to further hint that the Super Dragon Yoshi (as the classical Green Yoshi was originally called) may have actually been a Heaven-sent ally to Mario and friends. And I love Yoshi as a charactor all the more for it, no matter how "clumsy" it makes him look. (I can hardly picture him with serpentine wings, and personally belive angel wings look far better on him, anyways.)
Though . . . that does leave the question of where he gets the fire from. Too many spicy foods, eh?
(Also, I do belive the Yellow power from will also be implemented somehow, though I don't know how . . . stronger ground-pounds? Automatic ground-pounding upon touchdown?)
Yoshi has always been my favorite charactor (especially to play as) in the Mario games. I may just pick him up more often in Brawl, as well. His famous tounge may be made in to a Tether Recovery, for all we know! XD
(I'll have a pretty tough time choosing between him and Tails, my favorite charactor from the Sonic games, in "Mario and Sonic at the Olympic Games." )
* - In modern fantasy, the "hell-spawned" Dragon still exists, bit it's pretty much now called a Wyrm. YMMV between different realms of fantasy.