Well I know I for one sure am. I build my self a new computer and prepared for it as much as I could. Still haven't updated my GPU yet, as there are no final word on what's the recommended or minimum system requirements for this game.
But I think I'll go with a 64-bit Operating System(Vista or Windows 7) and use a full 4GB(or more) worth of system memory, as I haven't any plans to overclock anything yet.
Also from what I heard only the console versions will have split-screen co-op?
If that's the case then I guess I might build an additional rig for LAN games if that is true.