Stuff confirmed via the 3DS shots:
Starman
Superspicy curry
Poison mushroom
Metal box
Also we got a bit more insight into the 3DS stages
3D Land- now we know after the downhill portion, there will be the spinning blocks followed by several warp pipes.
Reset bomb Forest- Starts off on a stationary castle then Viridi appears drop the reset bomb to that the castle disappears and it turns into a scrolling stage through the Reset Bomb Forest
Arena Ferox- I think we got the order of transformations now
Spirit Train- Alfonzo drives all the time now
Living Room- layout is random like Tortimer's Island
Also, don't think we ever saw confirmation that toon link is still using his boomerang so now we do
https://www.youtube.com/watch?v=vqRNuDK-oL0