Microsoft just released Update Rollup 3 for Dynamics CRM 2013.
KB Article: http://support.microsoft.com/kb/2930480
This update rollup is specific only for Dynamics CRM 2013 deployment that has not installed SP1 updates.
The strategy of update rollup implementation post SP1 updates is well written here: http://crmtipoftheday.com/2014/06/10/update-rollup-strategy-post-sp1/
Excerpt from the KB Article:
- If Update Rollup 3 is applied, we recommend that you wait until Update Rollup 1 for Microsoft Dynamics CRM 2013 Service Pack 1 (SP1) is available before you upgrade to the Service Pack 1 release stream. This is because Update Rollup 3 may contain fixes that are not included in Microsoft Dynamics CRM 2013 SP1.