Soon we can expect a driver which will add single connector CrossFire, a month later software CrossFire will follow, CrossFire Overdrive in October and support for Quad/Tripod CrossFire should arrive in November or December:
8.41 Aug/Sept: Single Connector CrossFire
8.42 Sept/Oct: Software CrossFire
8.43 (Oct): CrossFire Overdrive
8.44 (DX10) / 8.46 (DX9) Nov/Dec: Quad/Tripod
8.45 (Vista only, 2 displays)
8.47 (XP) Dec/Jan: Extended Desktop