AMD has released new Catalyst 14.12 drivers for Linux

New Features:
The following section provides a summary of new features and supported products in this driver version.

OpenCL 2.0 support (requires 64-bit OS and compatible AMD Radeon™ R Series GPU)
VAAPI decoding support (H264, VC1, MPEG2, MPEG4)
Distribution specific package support for Ubuntu and Red Hat

Resolved Issues:
This section provides information on resolved known issues in this release of the AMD Catalyst Linux Software Suite.

[402835]: Unexpected pixmap's time stamp change on Ubuntu with composite enabled causes Linux Khronos CTS to randomly fail
[403420]: Driver install can sometimes have an error in Ubuntu 14.10 using GPL symbol before Kernel 3.16
[405011]: Driver installation may intermittently fail on Kernel 3.9.0
[409856]: Generate Distribution Specific Package' mode of Catalyst install does not create symbolic links for libGL
[407550]: Driver upgrade failed in Ubuntu with specific drivers

  AMD Catalyst 14.12 for Linux