DailyTech reports ATI's 80nm RV570 and RV560 GPUs will feature integrated CrossFire support. This means the card will no longer require a master card:
Without master cards, ATI will also be dropping the external Crossfire TDMS transmitter. Radeon X1300 and Radeon X1600 require neither the dongle nor master cards to operate in Crossfire mode, but they are relatively low end cards as well. Unfortunately, all is not beer and Skittles: the same memos claiming RV570 and RV560 have on-chip Crossfire support also claim that the chips may require a PCB bridge to really operate in full Crossfire mode. This is extremely similar to NVIDIA's SLI implementation.
Another positive aspect is that this will allow manufacturers to create graphics cards with multiple GPUs.