Mario and Sonic both stike a pose at one point, and Mario's looks like his You chose me! pose from the first SSB game (where he stuck that pose after you chose him on the character select screen) and it was one of his winning poses after multiplayer in SSBM.
Nice observation there. I completely forgot about that. Not surprising seeing as it's been ages since the last time I played SSB...and my character of choice was Luigi. Speaking of which, his
You chose me! pose there also made it into SSBM, but without the panting sound effect (if you want to call it that).
In fact, I sure as heck hope that they actually give him a real voice in this (assuming that he is in and if he's not, I'm gonna be one ticked chick) instead of recycle Mario's voice clips again. Honestly...