According to Ben Rudolph from Windows Phone Blog, both the Nokia Lumia 920 and 820 will be heading to AT&T. There is no word on pricing or availability as of yet, but we can expect to see more news on that later this month. Colors available for the 920 in store will be Red, Black and White while you can direct order Yellow and Cyan.
The Lumia 820 will be available in Black only with multiple backplate colors available. Some of the shells for the 820 will support wireless charging. The 920 has built in wireless charging.
Source: Windows Phone Blog