Remember this report about how the iPad was a cert for Verizon?:
“The tablet will be supported by multiple [mobile] carriers,” said Brian Marshall of Broadpoint AmTech, citing unnamed sources he said were close to the situation. “Verizon and others,” he continued. “Definitely Verizon. I’ve been told that’s a certainty.”
As I said at the time, there is more chance that Apple will expand to another US carrier which uses GSM than it will build hardware tailored to a single US network.