Hmm, let's see.
NWN2. I'm expecting a good campaign, but it's mostly for the toolset more than anything.
Hearts of Iron 2: Doomsday + Europa Universalis 3. Grand strategy games don't throw twitch into the mix. <3
Tactica Online: Turn-based tactical goodness? Yes, please.
Red Orchestra: Ostfront. Tactical teamplay emphasizing proper communication/coordination? Yes, please.
Armed Assault + "Operation Flashpoint 2". Coop
And whatever the Combat Mission series churns out. Awesome tactical series, that.
Sins of a Solar Empire. A 4X game in real-time. It'd be interesting to see how this one pans out.
Supreme Commander. I'm a bit more skeptical about this one at this point, since it'd be the one that approches the standard RTS the most, but hopefully the scope of the map/game will make it irrelevant. Either way, a coop campaign means plenty of fun.