Seem like the HTC HD2 T-Mobile phone is getting an upgrade before the device is even released. The official T-Mobile USA twitter account just tweeted that they will be releasing some details about changes to the HTC HD2 later this week (probably after MWC starts). I think the most likely guess is that they will announce that the HTC HD2 will launch with Windows Mobile 6.5.3 which is supposed to be far more touch friendly.
What would be really nice is if they announce that the HTC HD2 is going to support Windows Phone 7. This could explain the rumoured 4gb internal version ROM of the phone that is supposed to be coming soon.