Thanks for getting this out. I just updated my fusion drive setup (using neilhart's guide) with the new Chimera and Messages is working as it should. iCloud is online and so is the app store. I noticed that it will not boot with the -f flag. Otherwise good to go. I was never able to get this working with the Chameleon fix posted here in the forums, so this is a real help. Tired of booting up with my emergency Clover USB stick! Thanks again!!!
GA-Z68XP-UD3, core i7 2600k, Radeon 6870, ML10.8.2