The benefits to Apple, et. al., is pretty clear to me: The millions of people who buy a CDMA iPhone because that's all that is available at first will be desperate to buy a 4G phone once it's out; more phones sold, more contracts signed/extended.
E.g., remember the 1st iPhone was edge. How many of us bought it anyway -- and how many of us have subsequently upgraded to the 3G/3GS?
My thoughts exactly. Not sure why everyone thinks Apple would be concerned about making a single model of the iPhone compatible with all networks or future proof.
If anything Apple and Verizon would want an iPhone on the current verizon CDMA network and then up-sell everyone on a LTE 4G model in a year. The old CDMA versions become hand me downs to family or friends who sign up for their own contracts. Same strategy goes for the iPad.
Verizon is missing a huge opportunity here and I would be surprised if a Verizon iPhone and iPad doesn't come out this summer.