So far, I have seen no news of the black version of the HTC one being released on T-Mobile. A release date for T-Mobile would also be nice, and I doubt it's the 25th, as a forum user stated today. They wouldn't give you just a single day after the phone's release to purchase your device in order to receive the $100 visa card.
If you find any news of the black version's availability please share your info and post links if possible.
If you find any news of the black version's availability please share your info and post links if possible.