In pretty exciting news for HTC HD2 owners (amongst which I count myself as one).  The smartphone was spotted at Mobile World Congress running Windows Phone 7 series. (I only assumed this part, but it is not actually explicitly said in the source article)

Winmo.nl reports some very important information:

1. The device had a current copy of TomTom installed, which launched and ran perfectly fine! So much for no backward compatibility.
2. It ran fast, faster than the HTC HD2 runs on WM 6.5.
3. Lastly, the software was multi-lingual out of the box.

As mentioned earlier, this is great news for HTC HD2 owners.  Even if HTC never releases an official upgrade it will not be long before this ROM leaks.  In fact HD2 owners may end up running WP7 well before anyone else!

Read more at WinMo.nl here.

Thanks JVP for the tip.