Instead of just sitting idle and twiddling thumbs, it's seems like they have been doing something over at the AMD and ATI camp.
With a little research (aka Google.com), we found out that Dark Messiah uses an OpenGL interface. The performance gains would seem to be pointed more at an increase in OpenGL driver architecture, so games like PREY, Doom 3, Quake 4, Dark Messiah and more utilizing OpenGL should see a gain.
The normal array of bug fixes are in there and if you're using a high-end Radeon graphics card and want a bump in your OpenGL gaming, it's clearly a driver update worth doing this month. If you're updating to the Windows Vista version, just pay attention to the BSOD issues we noted in the introduction and you should be a happy little vegemite.
Till later this month, Happy Gaming and Benchmarking!