As noted by MacRumors, Apple has seeded the first build of Mac OS X 10.6.8 to developers. The new build, which carries number 10K521, confirms there’s room for at least one more Snow Leopard update before the release of 10.7 Lion, scheduled for this summer.
According to people familiar with the new build, focus areas for 10.6.8 are AirPort, Graphics Drivers, Mac App Store, Networking, QuickTime and VPN. Apple released the last public version of Snow Leopard, Mac OS X 10.6.7, on March 21, including fixes for Mac App Store, SMB servers and Back to my Mac.