Apple has seeded OS X 10.7.3 to developers. The update focuses on iCloud document storage and issues relating to several of Apple’s native apps.
Developers are asked to focus on bugs involving iCal, Mail, and Address Book. Apple also warns that installing this 10.7.3 build will prevent one from reverting back to older versions of OS X Lion.
This particular update weighs in at 633MB and the build number is 11D16. A Lion Server update is also offered alongside the regular build, and both files can be downloaded in the Dev Center.
The latest public version of Lion was 10.7.2, and it was released on October 12th with the introduction of iCloud on the Mac.