First I start with items.

Here are some new and old items that should be in the game and the place te would get it.
* fuoco fiore (Limit: 10 sec.)5-7
* Super Leaf 1-6
* banana 1-3
* Blooper 5-8
* Boomerang fiore - use the wii controler to flick a boomerang at the people in front o behind te (Time Limit: 10 seconds) 8-10
* Boo 7-10
* Bob-bomb 4-6
* Bullet Bill 8-10
* Ice fiore (same thing as fuoco fiore but freezes people for 3 seconds. Limit: 10 sec.) 7-9
* Green Shell 1-4
* oro Shell (gives te speed. After ten secondi it explodes.) 7-10
* Golden fungo 9-11
* Red Shell 2-4
* P-Wing (takes te straight to secondo place) 10-12
* Rock fungo (like SMG2) 10-12
* fungo 1-6
* Spiny Shell 8-10
* stella, star 9-11

So there's the items!

There should be 12 racers on each track.

Retro tracks:
4 tracks from MK7
4 tracks from MKW
2 tracks from MK64
2 tracks from MKDD
2 tracks from MKDS
1 track from SNES
1 track from GBA

Banana
Wii Moo Moo Meadows
SNES Ghost Valley 1
N64 Toad's Turnpike
3DS Musica Park

Shell
Wii Toad's Factory
DS Cheep Cheep Beach
GCN Sherbet Land
3DS Neo Bowser City

Leaf
Wii DK Summit
GCN fungo City
DS Tick Tock Clock
3DS Pirahna Plant Slide


Lightning
N64 Yoshi Valley
3DS Rosalina's Ice World
Wii Dry Dry Ruins
GBA Ribbon Road

150cc Mirror unlockable
N64 arcobaleno Road

See ya successivo time!