We told you earlier this week that Apple was preparing to release its first beta build of OS X 10.8.1 to developers, and the 10.8.1 beta has now been seeded for registered developers in the Mac Dev Center. Apple hasn’t noted any known issues or added features, and developers are asked to focus on compatibility with Active Directory, Microsoft Exchange in Mail, PAC proxies in Safari, SMB, USB, and Wi-Fi and audio when connected to Thunderbolt display.
This new version (build 12B13) is the first developer beta to be made available after Mountain Lion’s public release in the Mac App Store last month. Apple should be pushing out 10.8.1 as an official update for non-devs in the coming weeks. The current shipping version of Mountain Lion is 10.8.