http://usa.canon.com/cusa/profession...ersAndSoftware

From Canon website:

"The following fixes have been included:
1. Fixes a phenomenon in which the camera may not first use the center AF point to focus, when the AF point selection is set to automatic in AI Servo AF Mode.
2. Fixes a phenomenon in which focus cannot be finely adjusted with specific lenses when shooting remotely with EOS Utility Software.
3. Corrects Ukrainian language displayed on the menu for ISO Setting."