Apple has seeded yet another OS X 10.8.1 developer beta today (build 12B17). The update contains no known issues, and developers are still asked to focus on specific areas like Active Directory, iCal, and Microsoft Exchange in Mail.
The first 10.8.1 developer beta was released one week ago, and this second minor update indicates that the public release is right around the corner.
Apple released OS X Mountain Lion to the public on July 25th, 2012 for $20 in the Mac App Store. The first 10.x.x update to a major OS X release usually comes with many bug and compatibility fixes that were discovered in the first release. Expect it to drop soon.