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I've seen three screenshots, available on www.nintendo.co.uk and they alone reveal these characters are racable:
(That pink thing that fires eggs from Mario Bros 2)
Baby Boswer
Baby Mario
Bowser
Daisy
Diddy Kong
Donkey Kong
Koopa Troopa (YAY!)
Luigi
Mario
Para-troopa
Princess Peach Toadstool
Yoshi
Whether these are all of them, I don't know - and what's up with the two characters on each kart? Possibly a new mode?
> And how, exactly, does Mario travel to these parallel universes, learn
> to fly planes and drive submarines, save a land in his dreams and
> still have weight problems?
There's probably a copy of the unreleased "Mario's Transport Lessons" to get you aquainted witht the controls. Maybe.