The advertisement went up early this morning and lists the Lumia 920 as being available in yellow, red, white, cyan and black. The price... $149.99 with new activation and $599.99 unactivated.
The HTC 8X is being offered in purple for $99.99 with new activation and $599.99 unactivated.
Shipping is listed as "Reserve today. Will ship when available" and we aren't sure if the pricing will be the same for upgrades but it looks like they are. AT&T is not listing the new phones on their website but that may change later today.
You can find the pre-order listing here at Best Buy's website.
Thanks, everyone, for the tip!