Please review the below white paper in our collection of
White papers for Metro style apps
Migrating from Windows 8 Consumer Preview to Release Preview
This paper provides guidance and tips for migrating code assets built using the Windows 8 Consumer Preview (released in February 2012) to the Windows 8 Release Preview. It includes a list of new features, porting guidance, a change manifest, and helpful
tips for developers who are tasked with migrating apps built using the earlier Windows 8 Consumer Preview and Developer Preview releases.