Based off of the "30 Days Without an Accident" title, it's also entirely possible that there will be a time jump, where we catch up with the gang a month after their return to the prison.

I'd guess that a month without zombies isn't putting anyone at ease, though. If anything, that kind of quiet would make nervous-breakdown-prone-Rick even more so.

Is it some bizarre tactic by The Governor to make them feel at ease? So that they're not at all prepared for what's to come? After all, what better way to get an enemy than to make them think everything is over.