As others have already reported CU7 (KB2885603) for Dynamics AX 2012 R2 has been released. I wanted to point out one new feature I haven't seen announced elsewhere. You can now use the compare tool in AX to view changes to SSRS reports between layers. See the screenshots below for an example of the change.
Here is a screenshot of the compare tool for an SSRS report in AX 2012 R2 CU7:
Here is a screenshot of the compare tool for an SSRS report in AX 2012 R2 CU6:
There are many other changes in CU7 including over 1000 hotfixes, over 60 country specific enhancements, and many performance improvements.