I thought I would start a thread where we can all list, find and discuss firmware updates.
Canon 5D Mark IIIhttp://www.usa.canon.com/cusa/about_canon/newsroom?pageKeyCode=pressreldetail&docId=0901e024806daf9c
QuoteCanon U.S.A., Inc., a leader in digital imaging solutions, today announced a new firmware update for the EOS 5D Mark III Digital SLR camera that significantly improves the camera's performance and usability. In response to requests from professionals working in the fields of cinema and television production, the firmware update enables the use of uncompressed HDMI Output support, making possible more efficient video editing and monitoring procedures. Additionally, the upgrade supports the advanced needs of photographers through improved AF performance when capturing still images...................The new firmware update will be available, at no charge, in April 2013 from the Canon U.S.A. website and can be downloaded by end users or through Canon Factory Service Centers.
Firmware version 1.2.1 has been officially released
Windows
http://www.canon-europe.com/Support/Consumer_Products/products/cameras/Digital_SLR/EOS_5D_Mark_III.aspx?DLtcmuri=tcm:13-1048653&page=1&type=download
Mac
http://www.canon-europe.com/Support/Consumer_Products/products/cameras/Digital_SLR/EOS_5D_Mark_III.aspx?DLtcmuri=tcm:13-1048651&page=1&type=download