Well this isn't really considered info, but its something to keep you wanting Mario Kart Wii even more. It's more like predictions based on the E3 2007 footage.
Source: http://computerandvideogames.com
In my opinion this definantly has the potential to be the greatest Mario Kart ever. Wi-Fi play, which includes online races and battle mode, new Wii Wheel, and hopefully Nintendo will incorporate the other race tracks from previous Mario Karts, which it seems like they are doing for some at least.
Mario Kart DS put all the best circuits of past Mario Kart games together into one package of Mario Kart gold and Mario Kart Wii will do the same. We've already seen Double Dash and Mario Kart DS tracks in the new game, and have our fingers crossed for some N64 and even SNES action, too. NGamer takes a look at the tracks we've seen so far...
LUIGI RACEWAY
It's left to Luigi to gently introduce players into the ways of Mario Kart again, with a fairly basic stadium-sided banked loop that only seems to differ from its Double Dash!! counterpart by racing clockwise rather than anti-clockwise.
New: MARIO CIRCUIT
Brand new! Part of the Flower Cup - which makes it middling difficulty in the Mario Kart canon - this race around the grounds of Peach's Castle takes you downhill from the off, then around some sharp 180-degree turns to show off your powersliding.
New: TOAD TUNNELS
Based off the twilight village of the Toads from Super Mario Sunshine, this comes with giant-sized bouncy toadstools that form a gradually descending staircase of fun. Pretty eerie look to this one. Pretty basic look, too.
New: WARIO MINES
Very much Wario's track - machinery works overhead, scooping gold out of the caverns - this has some hairy barrier-less rickety pathways preceded by speed strips that really want you to fall off. The course heads into tunnels and out into quaint 'villages'.
YOSHI FALLS
We wouldn't be surprised to see all of Mario Kart DS's tracks make it into the game - not least because this generally featureless loop would be an odd choice for a 'best of' collection. Speed strips, multiple routes and speed-boosting water makes this a pure speedway.
PEACH BEACH
You'll recognise this from Mario Kart Double Dash!! - and a bloody brilliant course it is, too, barely 25 seconds a lap but with the same speed-scuppering rising tide as Koopa Trooper Beach of old and a great bumpy downhill area. Now give us Daisy Cruiser, Nintendo. Go on.
New: BABY MARIO MEADOWS
Greener's "I know I'm right" bet on the name for this wide-open countryside ramble. It's just possible to make out giant trackside Baby Mario and Baby Luigi caps on the first turn, before the snaking (shortcut-ripe but Goomba-laden) route through a big herd of happy cows.
Source: http://computerandvideogames.com
In my opinion this definantly has the potential to be the greatest Mario Kart ever. Wi-Fi play, which includes online races and battle mode, new Wii Wheel, and hopefully Nintendo will incorporate the other race tracks from previous Mario Karts, which it seems like they are doing for some at least.