[quote name='CorporalJackson']then they would lose money on the 360[/QUOTE]
Um... how? Most people would rather buy a 360 anyways then upgrade their comp. Microsoft seems very intent on merging the PC and 360 worlds together, with common Marketplace, Live on Windows, 360 and PC people playing against each other, why would they then deny their one killer app to a new operating system they are trying their hardest to build?
It wouldn't surprise me if they did a joint release, because it would probably be a huge selling point for how Live Anywhere would work.
Oblivion still sold a ton for the 360, and that's while it was available on the PC as well.
I wouldn't buy a 360 for Halo 3, but would I buy it for the PC if it was available around the same time? I sure would. I would also play it on Live through Windows Vista.
I don't think the 360 sales for Prey and Shadowrun will be hurt either, because they hit the PC on the same exact day.