(sorry for the bump, I haven't been here in a while)

Doom III and the Unreal Tournament series are a world apart. Doom III is more like an FPS version of Silent Hill (or Resident Evil, if you're unfamiliar with SH).

Now, the release date is very likely (PC version on August 3rd, yes, this year), and I have mine reserved... we probably won't see the Xbox version until very late in the year. However, Doom 3 for the Xbox is not a port, it's made specifically for the Xbox, so don't expect it to be 'dumbed-down' if you pick up the PC version. It won't really look better, I'm sure, but for the most part, I'm hoping for on-par graphics and very stable gameplay...