As OS X Mountain Lion’s launch nears, Apple has informed developers to start submitting their optimized Mac App Store software for review. OS X Mountain Lion launches later this month with 200 new features.

A complete, “Golden Master” version of OS X Mountain Lion was released to developers earlier today, and this is the build that we expect Apple to provide customers with this month. The update will cost $19.99 for Snow Leopard and Lion users, and it will be available via the Mac App Store.

OS X Mountain Lion includes several new features that developers can take advantage of such as iCloud integration, Notification Center, Gatekeeper, and Game Center.