anyway... I played the demo version today. i noticed a few weird things in the items.
-red shells (and triple): nothing different, except for icon is more 3d looking.
-green shells (and triple): nothing different, except for icon is more 3d looking.
-mushroom (and tripple): more of a boost, and icon is more 3d looking.
-bananas (and tripple): nothing different
-golden mushroom: seems to last longer, plus more boost on each click, and icon is more 3d looking.
-boos: didnt get, dunno if its in demo, but i thought i remember seeing it
-bullet bill: not in
-bombomb: didnt get, icon was more 3d.
-blooper: not in?
-star: character doesnt celebrate when they have it.
-blue shell: dunno if it circles over your head, but trail looked different.
-and finally chain chomp: icon showed up on rullet, but even when i was in 8th (slowed down to try to get it), didnt get it. probably icon was put in but no data, and the bullet bill replaced it later :(