-Announcement of no Story Mode of any sort. Especially so, considering they now have Mario, Sonic, Mega Man, and Pac-Man in the game. Still hoping we get a mode on the Wii U version that plays like SSE, though, with levels taken from all of the represented franchises.
-Rosalina's announcement has been a double-edged sword. On one hand, my favourite Nintendo character is playable in my favourite Nintendo franchise. On the other hand, she's been one of the most controversial characters simply due to the seniority mind set people have, that means other Mario characters should have gotten in because they came to the Mario franchise first. It's also helped push her into the spotlight, which is great on one hand, but on the other, it also means her fan base is more out in the open and viable to be harassed, since Rosalina fans traditionally were left alone due to never talking much about the character.
-3DS version is coming out AFTER I start college, meaning I may not get to play it as much as I'd like. I'd also like to buy it sooner rather than later, because knowing my luck, some other expenses will pop up a week before I buy it or something.