Cool , when will it be availible to buy? 
Hmm.. it hasn't been announced yet.. but an optimistic guessing.. at the end of 2007 maybe.. or 2008.
There's another game comin that I also look forward to.. that is APB (all points bullentin), and it's comin this year. Here's some
info on ABP:
All Points Bulletin (APB) is a massively multiplayer online freeform combat and driving-based game, designed by the creator of the original Grand Theft Auto (GTA) franchise. Developed by Real Time Worlds Ltd. and published by global online entertainment company, WEBZEN Inc., APB brings players into a living, breathing city where cash is king and territory equals respect. In a fight to dominate the expansive world of APB, players must decide which side of the law to abide by, as Law Enforcement who take on the challenge of supporting and safeguarding justice, or as Gangs, who operate against the law and any opposing groups by any means necessary. APB will provide players with ultimate customization options from their weapons, vehicles and clothes to their attitude, music and environment.
ABP will only appear on the Xbox360 (atleast in the beginning).. but.. when CrimeCraft arrives I will also play it on the 360.