After hearing that the patch made reader Jason's Mac play faster, WoW Insider's Adam Holisky saw his FPS jump from 30 to 50 on his first-gen Intel iMac (he also has 2gb of RAM, and installed the graphics update with 10.5.2). The picture on the upper right was a test under 10.5.1, and on the lower right was after the update.
Pretty slick. I'd imagine that this would probably affect most 3D games (although who knows how EA's games will work on the Mac at any given moment). The only note that might document this in the update itself is just a "general stability" fix for "third-party applications,' but if you see your 3D go faster after 10.5.2 let us know. Azeroth has never looked so good.