ATI's integrated chipset with DX10 support comes in 2007 and we learned a few key features. It will support 52 PCIe lanes. This is enough to have three PCIe 16X slots and a single 4X slot. Don't know whether you will really need it but sounds and looks really cool.
It also has HTX support which will allow you to plug the add in card in processor and memory. This avoids going via chipset and is done using Hypertransport marchitecture.
The RD790 is also Hypertransport 3.0 compatible and will be able to rock and roll with new Athlons probably supporting both socket AM2+ and the new socket F.
The board supports dual gigabit LAN and it has its own cache memory. The cache memory should help lower latencies and provide more bandwidth to a board.
You can find more at Chile Hardware and we would like to thank these talkative boys for their cooperation. µ