The Microsoft Dynamics CRM Sustained Engineering (SE) team have been hard at work to get the UR12 release to us on Jan 7 2013.
You can find the related Rollup 12 items here
- Microsoft Download Center: Rollup 12 Downloads
- KB Article: http://support.microsoft.com/kb/2795627
- Microsoft Update: http://catalog.update.microsoft.com/v7/site/search.aspx?q=2795627
Rollup 12 Build Number: 5.0. 9690.3218
Quick Summary
http://msdn.microsoft.com/en-us/library/gg309589.aspx#BKMK_UR5
- Extended Browser Support
- Enhancements to Activity Feeds
- Updated User Experience for Sales and Customer Service and Product Update Functionality
- Custom Workflow Activities for Microsoft Dynamics CRM Online
- Developer Toolkit Support for Microsoft Visual Studio 2012
- Retrieve and Detect Changes to Metadata
- Use Execute Multiple to Improve Performance for Bulk Data Load
Dynamics Bing'd 
I can see MUI and Client…. No Server update. Any idea when it will be released?
It will be soon, with previous rollup issues in the past I think they want to get things right this time.