You hardy can have missed the announcements from Microsoft how they will continue delivering updates for Microsoft Dynamics 365 for Finance and Operations. In fact the full Dynamics 365 product range will be on the same update cadence. Depending if you are already running Microsoft Dynamics 365 or not there are changes which you also need to prepare for yourself.
Last week, I was upgrading AX 2012 R2 CU7 to CU8 and ran into a model store error. The error was similar to http://blogs.msdn.com/b/axsupport/archive/2014/01/08/violation-of-primary-key-constraint-pk-modelelementdata-elementhandle-error-installing-some-hotfixes-on-microsoft-dynamics-ax-2012-r2.aspx
It scared the hell out of me! First thing that came to mind was: is my model store corrupt in...