CoD2 is the only WW2 game I'm remotely interested in. Xenon version coming out is very, very nice indeed!
Now, having said that, I think Xenon will actually help out PC gaming. I'm not crazy (Well..), but think about it for a second. With the graphical prowess of Xenon, and XNA toolage, more developers should be able to build PC/Xbox 2 games more efficiently. They can bank on the Xbox 2 version to bring up the bulk of sales and not have to rely on PC sales as much.