Just around the launch of Dynamics AX 2012 R2, coincidentally we have the latest Cumulative update 4 (KB2765124) for Dynamics AX 2012 and Dynamics AX 2012 Feature Pack. This update is very important as it includes all other cumulative updates and hot fixes that were previously available. This is mainly important for Customers who are about to deploy AX 2012 and to secure them with all the issues that were resolved in that release. Do note that this CU4 release is not applicable for Dynamics AX 2012 R2, and it would have it's own releases for Cumulative updates.
The original details of the Dynamics AX 2012 was released on Dynamics AX Sustained Engineering Team
Ironically the release for the new Cumulative update is not available in the List of all Hotfixes/Cumulative updates for AX 2012 page until now, hope they consolidate it in one location.
Here is the direct link to download the AX 2012 CU4 from Partnersource