It should be out in March.
So far in the 8.35 March drivers, I haven't seen the RHEL5 support. I asked AMD if they wanted me to add the RHEL5 support to the Fedora scripts, but since they officially support RHEL, they will be creating the scripts. I take it though the scripts won't be in the drivers till April or May. Though if you run the FC6 command it will probably work for RHEL5.