I'm really looking forward to seeing how Nintendo's gonna mix the best of Mario 3D platformers and Super Mario Bros. This game alone might as well be a good enough reason to buy a 3DS (I know I'll get one just for the Mario games).
It will be a cool game, but my sister is planning to get the game. I'll be stuck with Paper Mario and Luigi's Mansion. If they reveal other characters other than Mario, I might consider playing this. For now, though, I'm not too interested.