I think Feb sounds right for Infamous... From what Ive seen it looks like its going to be amazing. Would like to see a bit more running around the streets action, but cannot wait, and is my most anticipated next gen title so far.
It depends on how bad a state Driveclub is.. I guess they could go end Jan/Early Feb and Infamous would still be fine Feb 21st.
DriveClub would have gone to disk manufacture last/this week. So a 21st Jan Release would give them just under another 3 months Dev (with Day 1 Patch)... depends on if thats enough or not :)