I have the October 27 ML version on my 600D. When I press the menu button to change the video settings, such as resolution, it appears an overlayed rectangle area on the upper part of the screen, containing a fragment of the last frame from the preview image.
See picture here: http://imageshack.us/photo/my-images/268/foto1078n.jpg/
Apart, to whom may be interested, the audio recording works fine, also with an external SMX-10 mic. The camera provides power to the mic, so there is no need to put the 1.5v battery on it.