This week's Bungie.net udpate carries a few morsels of information about the yet-to-be-released PC version of Halo 2. The primary news is that despite hopes, there will be no compatibility between the PC version and the Xbox version of Halo 2.

...[T]he gulf (more than two years) between the launch of Halo 2 on Xbox and Halo 2 on PC means that a level playing field would be impossible. Add to that the fact that both versions have their controls and aiming system balanced and tuned for that system's abilities and you would have a lopsided situation at best. Halo 2 Xbox players will continue to play against Xbox and Xbox 360 players, and Halo 2 PC players will play against other PC players.

Halo 2 will also require Microsoft Windows Vista to run, although a DirectX 10-compatible video card will not be required.