EliteBastards quizzed ATI on the subject, and the red team replied that OpenGL games are indeed not supported in P965-powered CrossFire configurations with the new Catalysts. OpenGL support will be added "by the end of the year."
CrossFire support aside, the Catalyst 6.9 release claims performance improvements in both 3DMark 2006 and Doom 3. ATI's OpenGL performance optimizations can cause Doom 3 performance to go up by as much as 9.3% on Radeon X1000-series graphics cards, with Radeon X1900 cards running at 1600x1200 seeing the highest gains. ATI also fixed miscellaneous bugs in Desperados 2, Doom 3, Oblivion, Flight Simulator 2004, Splinter Cell: Chaos Theory, The Settlers: Heritage of Kings, Tiger Woods 2005 & 2006, and Tomb Raider: Legend.