So it's somewhat moot until the unlocks show up, but I talked to a representative on Wednesday when the pre-order came out, she said that they would be willing to give out an unlock code if you purchased the phone off contract. I did that this morning, at which point I called another rep, and he said he created a case for me to have them send me an unlock code. He said it should be resolved at the latest on the 17th of November, though it's unclear whether or not I'll actually get an unlock code. Later with the help of a friend, I repeated the process, and that rep requested I fax in my receipt as confirmation, and basically ended with the same information; that the unlock code would be forthcoming.
If this happens, and I get an unlock, I will hunt down a T-Mobile sim and try it out. I believe in my area, T-Mo LTE is still primarily on the 1700 slot. I don't know if I'll be able to confirm which band it uses, but if I get either 3G or LTE data, I will let everyone know. Optimally I'd like to use the T-Mo, but I'll still be satisfied with using straight talk for half as much as I was paying with Sprint.