The "AMD Catalyst 13.11 LINUX Beta V9.95 Driver" is now available from AMD.com as the latest Linux Catalyst Beta.
This driver lists official resolved issues as a crash when resizing Konsole, brightness adjustment issues, kernel module compile failures, avoids a new GPL kernel symbol, and resolves a system hang on resume from S4 with an OpenGL screensaver. AMD acknowledges there's still open SteamOS issues about screen tearing with v-sync enabled and the SteamOS overlay while playing games can result in a slower UI response time.
Now that I'm working my way back to the states, I'll run some new AMD Catalyst driver tests to see how the driver update does -- especially if the AMD Radeon R9 290 Linux support is less of a Linux disaster. Share your AMD Radeon Catalyst driver experiences with this new update in our forums.