This is interesting and relevant: http://gonintendo.com/?p=10407
It also looks like Rockstar are doing something to try and support the Wii – they released Table Tennis (kinda lame), Manhunt 2 (haven’t tried it) and Bully Scolarship Edition (haven’t tried it) so there is at least something between them these days. You would think with Manhunt 2 and Bully Nintendo are losening their reigns a little bit.
Maybe not GTA4, but who knows if a spinoff will get released.
I’m not a huge GTA fan either way.