AMD now offers Catalyst version 14.1 beta drivers for Windows and Linux, a bit of a delay from the most recent plan to have these out by Friday. Among other things, the new beta drivers offer support for AMD's new Mantle API through the just-released patch for Battlefield 4. Here's word on the Mantle beta:

• Mantle Beta driver support
  • AMD’s Mantle is a groundbreaking graphics API that promises to transform the world of game development to help bring better, faster games to the PC
  • Performance gains of up to 45%(versus the DirectX version) for Battlefield 4 on the R9 290 Series
  • Performance gains of up to 200% (versus the DirectX version) for Star Swarm on the R9 290 Series
    • AMD Catalyst 14.1 Beta must be used in conjunction with versions of these applications that support Mantle
    • It is expected that these applications will have future updates to support additional AMD Mantle features
  • AMD Mantle Beta driver is currently supported on:
    • AMD Radeon™ R9 Series GPUs
    • AMD Radeon™ R7 Series GPUs
    • AMD Radeon™ HD 7000 Series GPUs
    • AMD Radeon™ HD 8000 Series GPUs
    • AMD A10-7000 Series and AMD A8-7000 Series APUs