Bah. Spin-off games hardly appeal to me nowadays. In fact, the last one that I brought was Mario Kart DS, back in 2005. That's not counting Super Smash Brothers Brawl, of course, since it's technically not a Mario game.
The current roster makes you wonder who else will show up. It would be neat if characters such as King K. Rool, the Koopalings, any of the WarioWare employees, or even Rosalina pop up as playables or spectators.
There may also be questions in terms of the control schemes as well.
We know that 12 characters are confirmed to be playable, but it does make you wonder who else will be playable too. I do predict that 12 more characters will be playable, and since Square Enix is involved with this game's development, a few Final Fantasy characters may be in the mix too.
Who these 12 characters are, I was thinking...
King K. Rool