Most likely old news or has been this way all along.
Just because T-Mobile has the iPhone in the Fatherland doesn't mean they'll get it in North America. From what i understand, T-Mobile U.S. is pretty widely regarded as having shit reception and even shittier data service, so i doubt Apple would go with them unless they SERIOUSLY upgraded their network.
It's almost a foregone conclusion that the iPhone will be coming to more carriers (particularly Verizon) when the AT&T exclusivity period is up next year. But any other carriers would depend largely on the state of their infrastructure. Apple doesn't want to give their halo product to carriers with bad networks, because Apple ends up taking a lot of flak for it. (e.g. Antennagate.)