I recommend all T-Mobile, AT&T, and Verizon customers order the Verizon version of the 6 as it will work perfectly on all three, including all other GSM carriers worldwide. The only carriers it won't work on are Sprint, and all other CDMA carriers worldwide, which is quite small.
However, according to what I've been able to confirm, it looks like non-Verizon customers won't be able to pre-order the Verizon version as apple.com will require that you provide account information. This (to my knowledge) is different in store since anyone can purchase a Verizon iPhone without providing Verizon account information since they expect you to just pop in your own SIM.
If I am wrong about this, please put me in my place. I would love to be wrong since I don't want to wait in line this year!
However, according to what I've been able to confirm, it looks like non-Verizon customers won't be able to pre-order the Verizon version as apple.com will require that you provide account information. This (to my knowledge) is different in store since anyone can purchase a Verizon iPhone without providing Verizon account information since they expect you to just pop in your own SIM.
If I am wrong about this, please put me in my place. I would love to be wrong since I don't want to wait in line this year!