The Co ops for both on and offline, are an invasion thing. I don't think we'll get bots as such. But I think this invasion thing will comprise of either...
Up to 4 in an arena, fending off as many Drudge meanies as they can. Or..
Similarly, Kinda single player enemies racing out in the multiplayer maps. So say it could be like The Streets level. And instead of fighting each other, you face varying conduits popping open and chucking out Drudge and puppets.
I hope it's the later. But I'm just happy HVS are putting in ANY local multiplayer.