Revit Architecture 2013 now has a service pack which can be downloaded from here:

http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=20121970&linkID=9273944

For details you can download the associated PDF:

http://images.autodesk.com/adsk/files/enhancements_list_rac_2013_ur1.pdf