Apple is rushing to improve the new version of Mac OS X 10.6.8, since we already have a third beta version in just three weeks. Apple today seeded Mac OS X 10.6.8 beta 3 build 10K531, latest seed weigh around 1 GB for the combo version and 450 MB for delta version. Apple asks developers to focus on exactly the same things as before, namely: AirPort, graphics card drivers, Mac App Store, how networks work, QuickTime and VPN.
Given that this summer is scheduled to launch Mac OS X Lion, it is possible that Apple Mac OS X 10.6.8 to launch shortly after the WWDC. Mac OS X 10.6.8 available to download for all registered developers.