So Mountain Lion brought us alot of new graphic support. Most interesting is native support for 69xx cards! If you have a Mac Pro, all you need to do is to flash your card and it will run fine in Mountain Lion, no cold boot bug or anything. You can flash 6000 series using the special Zeus 6000 series version found here It will even work in Mac Pro 1.1 / 2.1!
For hackintoshers, it’s a bit more complicated. The bootloaders need added support for ML and 6000 series. And cold boot bug is still present. Research is still going on though.
Personally I’m just hoping we can port these ML drivers to Lion so we can get support soon, not 6 months from now or whenever ML is released.