What LTE bands will T-Mobile be using?

I heard that T-Mobile will be upgrading their network to LTE speeds shortly, and that they will be using the same LTE band as AT&T (band 4).Is this true? Which iPhone model should I get to insure my iPhone will function properly on T-Mobile with the LTE speeds? People always say the Verizon one since it supports more bands, but this iPhone will only be on T-Mobile's network.

L9ok at this story please.
http://arstechnica.com/apple/2012/09/want-global-lte-roaming-on-iphone-5-dont-buy-it-from-att/

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