The RD500 will be branded as the Crossfire 1600.
The chipset should be ready in a month or two. ATI recognises the importance of Conroe and wants to support Intel as much as it can. The bottom line is to sell as many dual graphic cards as it possibly can, but ATI will sure start working hard to promote its chipsets, but it first have to finish the chipset.More info over at The Inq.
ATI is also working on RD600, the next generation PCIe chipset that can support PCIe 16X slots but this baby will come a little bit later.