I think AT&T giving discounted renewals six months in advance is good indication that they will be losing exclusivity early in 2011.
It is, or at least I thought was, well-known that the exclusivity agreement Apple entered into when developing/releasing the iPhone had a term of five years.
Interesting. Wouldn't it be an advantage for another network to leak that information to deter signing with att?
I would imagine there are HUGE penalties for this. Also, just because AT&T's exclusivity agreement expires in 2011, doesn't mean another carrier has agreed to carry the iPhone yet.