Cumulative Update 1 (CU1) for Microsoft Dynamics AX 2012 R2 contains hotfixes for issues that have been resolved since the release of Microsoft Dynamics AX 2012 R2.
Note The build number of this cumulative update package is 6.2.1000.156.
Before you install this cumulative update package read the Microsoft Dynamics AX 2012 R2 Cumulative Update 1 release notes carefully.
Many of the fixes are to do with the Retail module os if you work in that vertical then checck out this update.