By most accounts the iPhone 5 will not have LTE. That's going to sting with Verizon customers in the United States. While it will probably support HSPA+ on AT&T which is already decently fast, Verizon CDMA is direly slow. It will be a hard sell to get Verizon customers to pass up LTE for the next two years when there are already a few really good Android phones with LTE and most major cities have LTE coverage right n…
If I were Apple, I would be focusing on diversifying the carrier portfolios to gain leverage over the vendors for a good data plan. If Sprint is willing to provide an acceptable LTE plan, give them exclusivity, and to hell with VZ and AT&T.