Are there or will there be any other games on the Wii except SSBB to use the GC controller ?

I hope that Mario Kart will use it at least ...

MK won't use it and other games prob won't either

There are quite a few, actually. All of it's fighting games do, I know that for a fact. Also, I believe most games that are multiplat with the PS2 support the GC controller (since that would have been easy to program for).

According to BenKenobi MK does have an option for the GC controller. I don't see why, but he says so. I say prove it mr Kenobi!!!

You can use it for SSBB, Metal Slug Anthology, NiGHTS, Mortal Kombat, Fire Emblem: Radiant Dawn, Resident Evil 4 (start with the nunchuk then unplug it and the GC controller will work) and both Dragon Ball Z games. I'm sure there are others too, just look on the back of the case. IGN reviews tend to mention all the control options as well.

I hope not, with the wheel is suficient.

 He was most likely referring to this image that was shown on famitsu yesterday

 You'll want to focus your attention to the A near the centre of the screen, as well as the B in the bottom left corner of the screen..

Could be a coincidence in choice of colour, but most assume it means what it looks like it means (including myself) 

 it seems hard to use (so small)

@tabsina, ahhh that seems likely then as all wii games normall just have a whitish A circle and a rectablish bluish B.

i'll be quite annoyed if it has GC support, but no wii remote/nunchuck support