- Verizon iPhone won't be able to use data while taking a call. Verizon's current 3G network does not support this feature. AT&T does.
- Verizon iPhone's antenna has been revised and moved the volume rocker and mute switch down. This means that if you are switching from an AT&T iPhone 4, you will have to buy a new case for it.
- Verizon iPhone won't be using their 4G LTE network. What does this mean? Verizon's 4G LTE will be using sim cards like AT&T and T-Mobile. This enables their users to switch phones by swapping sim cards. Verizon's iPhone is stuck with CMDA technology. CDMA = no sim card. So why would you want to be stuck with 3G CMDA when they are rolling out 4G devices?
So if you ask me if you should get the iPhone now, I'd say wait till they roll out one that supports their 4G networks. But if you really can't then by all means go ahead and buy it :D.