The posting was on RadeonHD drives. My understanding from phoronix is that it is headed by RedHat folks and the like, not AMD. On top of that, they have already been given NDA spec documentation before any public release.
On the fglrx side of things, it supports the new hardware, just as well it does the old. It does not have CrossfireX support for the 4xxx series, nor any of the predecessors.