The bands for the ATT model are correct for T Mobile based on a review of the bands via Nokia's website. The Verizon has band 4 4G LTE, but does not support WCDMA or GSM. My understanding is that this means that if you are in T Mobile's refarmed 4G LTE area you would have 4G LTE coverage via band 4, but no backup 3G coverage and no faux 4G coverage in areas that are not refarmed. The Verizon model does not look like a good option for T Mobile users.
Also interested to know if they will be locked. Have not seen anything on that yet.