The December 2012 Service update has been released to CRM Online; with Update rollup 12 for CRM 2011 On Premise to be released shortly. Updates where made to things like the SDK and additions to cross browser are present for both Online and On Premise. For a full list of features that are present for the Polaris aspect please refer to the Polaris documentation. There has been a lot of effort to document some common items that we ran into during the testing of update and a number of KB articles were written. We wanted to give a single concise source for all of the documents that were written or updated for this release much like what we did with UR 10.
Update Rollup 12 for Microsoft Dynamics CRM 2011 is available
Google Chrome becomes unresponsive when logging into Microsoft Dynamics CRM Online
Microsoft Dynamics CRM 2011 Integrated Authentication with Firefox in Update Rollup 12
Firefox or Chrome users are repeatedly prompted for credentials in Microsoft Dynamics CRM 2011
FIPS 140-2 Compliancy with Microsoft Dynamics CRM 2011 Update Rollup 12
Microsoft Dynamics CRM Compatibility List
Indexes added with Microsoft Dynamics CRM 2011 Update Rollup 12
How to continue using the classic forms after applying the December 2012 Service Update