There is the "Do Not Disturb" feature. I was hoping for a major revamp of Notifications. Guess that would be too much to ask, considering we kinda sorta just got that with iOS 5.
I'm still hoping that they'll give us toggles in a 6.x.x update. I really wish they would implement them, it can't be that hard considering we've had them via SBSettings since iOS 1 on the iPhone v1.