AMD Catalyst 12.11 Beta 11 Released For Linux
While there isn't any official change-log for Catalyst 12.11 Beta 11 compared to the earlier 12.11 Linux betas, it's now available for download from AMD.com.
The Catalyst 12.11 Linux graphics driver has been in beta going back to late October. In mid-November was a Catalyst 12.11 Linux beta driver that improved the OpenGL driver performance namely for Valve's Source Engine games coming to Linux.
The x86/x86_64 Linux Catalyst 12.11 Beta is nearly 110MB in size while the current stable release is Catalyst 12.10 from late October.