Windows Phone 7 retail material hitting AT&T stores this month?

It is starting to look like Windows Phone 7 is definitely launching sooner than later. We have already heard several Microsoft employees mention October as a probable launch date (here and here)  and today this AT&T document indicates that the retail signage material for WP7 is about to hit the stores this month on July 24th to prepare for a fall launch.

Source: Engadget