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You can see the HTC HD2 on the ordering page on T-Mobile website now, but it says coming soon.  Here's the description.

HTC HD2

Download books, TV, movies and more with the fastest processor speed available. Get the largest touch screen on the market, and you'll forget it's a smartphone.

Learn more about the HTC HD2 smartphone Coming Soon

T-Mobile HTC HD2 HTC Windows phone 

The HTC HD2, exclusively from T-Mobile, has the largest multitouch Smartphone screen ever (4.3") and operates at 1 GHz-the fastest processor speed on the market. It will redefine what you think a phone can be.

• MobiTV® - It's the flat screen that follows you. Watch your favorite TV shows live and on demand while on the go.
• Transformers^TM and Transformers 2 are preloaded on your HTC HD2.
• BLOCKBUSTER® - Download and watch the latest movies.
• Barnes & Noble® - Over one million eBooks, magazines & newspapers. Sample any eBook free!
• Gogo® Inflight Internet - Take Off and Never Lose Touch. Connect to the Internet on your next flight.

source: HTC HD2 Forum