At a New York launch event, Microsoft will officially announce the upcoming release of Windows Phone 7-based handsets.  According to Engadget, which has been invited to the event, T-Mobile and AT&T should both have some handsets to show off to members of the media.  Verizon and Sprint will have to wait until early 2011 for CDMA handsets.  As for AT&T and T-Mobile, handsets should go on sale around November 8th.