Engadget reports that the terms on the Apple and AT&T exclusivity deal is a five year deal. Since they entered the deal in 2007, it would mean that the exclusive would end in 2012, opening up for more carriers by then.

The confirmation comes in form of court documents filed by Apple in response to a class-action lawsuit against Apple and AT&T for locking users into a five-year period, instead of the two years allegedly promised.

Unless Apple manages to renegotiate the deal beforehand, which it could certainly do, it remains to see if the iPhone will be exclusive to AT&T until the end of 2012.