Service Pack 1 is now available for AutoCAD 2012 and can be downloaded directly from the link below:
http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=17800098&linkID=9240738
This Service Pack resolves a number of issues which are detailed in the ReadMe document along with installation instructions. Please make sure you read this important document before carrying out the service pack installation.
Service Pack 1 is available for 32bit and 64bit installations and is a 12Mb or 16Mb download.