AMD has released AMD Catalyst 13.11 Beta drivers for Linux

Highlights of the AMD Catalyst™ 13.11 Beta V1 Driver for Linux:
This release of AMD Catalyst™ Linux introduces support for the following new features:

Products:
AMD Radeon™ R9 280X
AMD Radeon™ R9 270X
AMD Radeon™ R7 260X
AMD Radeon™ R7 250
AMD Radeon™ R7 240

Resolved Issues:

[383176] System hang up when startx after setting up an Eyefinity desktop
[384193] Permission issue with procfs on kernel 3.10
[373812] System hang observed while running disaster stress test on Ubuntu 12.10
[383109] Hang is observed when running Unigine on Linux
[383573] AC/DC switching is not automatically detected
[383075] Laptop backlight adjustment is broken
[383430] Glxtest failures observed in log file with forcing on Anti-Aliasing
[383372] Cairo-dock is broken
[378333] Severe desktop corruption is observed when enabled compiz in certain cases
[384509] glClientWaitSync is waiting even when timeout is 0
[382494] C4Engine get corruption with GL_ARB_texture_array enabled

  AMD Catalyst 13.11 LINUX Beta V1 Driver