"Verizon's CDMA network doesn't support simultaneous voice and data as with the GSM version"
This is probably a deal killer for me. I do this quite frequently. I also remember on the old edge network data activity sometimes sent callers to voicemail, which is unacceptable. Hopefully Verizon does not have that issue as well.
My biggest hope is that competition forces AT&T to be less ridiculous about data pricing for people with multiple devices, tethering, hotspots, etc.