Apple has continually discussed switching to Verizon's CDMA network and even expanding to that network. According to this source, a switch to CDMA would require a total redesign of the device. But, if any of you follow LTE technology should know that all major carriers are going ahead with LTE and it is a technology that requires 4G SIM cards. This would bring Verizon closer to something AT&T already runs and delete the necessity for Apple to redesign the phone. In my opinion, I believe Verizon users will see an iPhone by this time next year. I am not 100% sure, but all of the signs point towards it and I am willing to bet on it being such a gadget whore as I am.
Here is the source:
http://www.wired.com/magazine/2010/07/ff_att_fail/all/1
http://www.engadget.com/2010/07/19/a...ozen-times-an/