Well, we've known for a few weeks already, but nothing like an official announcement (via Twitter) that T-Mobile U.S.is indeed getting the HD2:

T-Mobile will be the exclusive U.S. carrier of the HTC HD2 –slated for launch this spring! Sign up for e-mail updates 

They even give a link for sign-ups for more information (found here) and we imagine a pre-order.

"Exclusive" , eh?  Guess that may put a kabosh for the rest of us not on T-Mobile.

Read the official press release here for more details.