If I had to guess, I'd say it'll be the same game (collection), but the menu screens will navigate slightly differently (with Wii friendly controls).
I was sorta also thinking they might do something like in the Mario Party games: highlight the game you want to play and a little movie of the game starts playing (I think that little feature started in MP5..). I was thinking it'd be neat if they had little fun facts and tidbits about the game too, but that's probably just wishful thinking on my part (what don't we know already about these classic games anyway? XD )
Oooh! Interesting thought: is this going to be SMAS or SMAS + SMW??