An unconfirmed source says the HTC Obsession aka Diamond 3 will supposedly be released on At&t and T-Mobile this year with WM7 and there are no reports of a CDMA (Sprint/Verizon) version in the works.
The specs that we have so far (via WMExperts) are a Qualcomm Snapdragon 1GHz processor, GSM/HSDPA connectivity, 3.7 inch capacitive AMOLED display with multi-touch, 5 megapixel camera with flash and HD video recording, 512MB RAM/512MB ROM, 4GB of internal storage, microSD expansion (up to 32GB) and a 1230mAh battery.
Source: BoyGeniusReport