Apple seeded Mac OS X Lion 10.7.3 to developers, registered developers can download the first beta of Mac OS X 10.7.3 build 11D16. The new version improves the operating system, but the main changes have taken place for icloud, Mail, iCal and Address Book.

People familiar with the first external build of the forthcoming update — labeled OS X Lion 10.7.3 build 11D16 — say the Mac maker has requested developers to focus their evaluation efforts on iCal calendars, Mail, Address Book and iCloud’s document storage.

Seed Notes :

OS X 10.7.3 build 11D16 Lion Seed Notes. OS X 10.7.3 Update Lion year update to OS X is Lion 10.7.
Known Issues
Focus Areas
icloud document storage
Address book

OS X Lion 10.7.3 can be downloaded from Mac Dev Center.