Apple have just rolled out a new update to their next-gen OS, OS X 10.8 Mountain Lion. The developer preview has been pushed up to build 12A206j. This update replaces the current build 12A193i, which was released a little over two weeks ago.
Apple notes that "MacBookPro3,1", which links up to mid-to-late 2007 models, is not compatible with the new build of Mountain Lion, but will be fixed in later builds of the OS. There aren't many other details about the update, or what improvements it has made. But it seems Apple are baking in some final tweaks for developers leading up to their Worldwide Developers Conference next month.
The company is expected to provide extensive previews of Mountain Lion at the conference, with the public release scheduled for "late summer".