HTC has been mum about Windows Phone 7. I guess their concentration is on HTC Desire HD and Z. Nevertheless, AT&T is using one of their devices in their adverts. It is the HTC Mondrian.
Tag: Mondrian
Leaked Windows Phone 7 ROM Called HTC Mondrian
It might not mean anything at all. However, with that 100 Mb file and an interesting name like HTC Mondrian, it is expected that the people of XDA Developers are excited about.