http://wii.ign.com/articles/826/826602p1.html
"we've been told that the customization on any of the styles is endless, actually letting you move any button to any position on any control type."
"Other attacks we've seen already include a floating Metroid that sucks onto battlers, a massive attack of multiple 2D Advance Wars sprites, various Pokemon, a dashing Drill Dozer attack, the Excite Bike attack (similar to the Advance Wars move), and then of course the fire flower, baseball bat, beam sword, and the like."
"Since each character can also switch colors pre-fight, Nintendo took the opportunity to seamlessly include Dark Link as one of the character options."
"Sonic is also an interesting fighter, as he has a ton of seeking moves. A regular special attack sends him spinning into the air at what seems to be the nearest character, delivering a combo of hits in the process."
And some other stuff.