It hasn't really been a question of if the HTC Snap is coming to T-Mobile; it's just a matter of when, and for how much. And if this product sheet obtained by BGR is on the level, we should see it on July 15. That's in the same window we've been hearing all along, so it's a good bet it's legit.
As for price? That's still up in the air, though it's doubtful you'll have to take out a loan to put this puppy in your pocket.