I’m pretty sure the console versions will be stripped down from the PC version, and not the other way around. And as in the past, they will have their own online community.
I really doubt we will see both PC and console players on the same server. The console idea is not new, and is hinted on some of the old interviews. If I remember correctly, the devs don’t mind consoles (and their controllers) because all players would basicly be on the same playing field. You can even add a bit of aiding to the game mecanics to compensate any lack of control and precision.
Personally I think keyboard and mouse are far superior for first person shooters than a gamepad. Especially if you take into account all the non-shooting stuff you have to do. We have almost 10 times more buttons. Attempts at solving this problem usually results in crappy PC versions.
An older reason, which seems to be on the path of being a non-issue, are the patches. PC versions are easier to patch. But now, with most nextgen console having harddrives, maybe this won’t be a problem.
Similar to above: New Content. While hard drives could help here too, it might only be good enough for official content. Things might not go smooth for the community content.
Just look at it this way, it’s hard to keep the Mac and PC community paired up, it’s going to be a lot harder to for the Console and PC. This doesn’t mean I’m against their existance. But if there are going to be compromises, i’d rather see the split communities.