A bug in Tribe (which is found and fixed, but won't be visible until the next ISO), caused that nouveau-dri is not removed on installs were users select the catalyst driver for their install. This is causing a conflict now with updating catalyst, giving an error that catalyst-utils and libgl are in conflict.

To correct this issue, please remove nouveau-dri, when you run a system with ATI/Radeon graphics, and the catalyst driver:
sudo pacman -R nouveau-dri