Just announced: A major firmware update for Canon 5D Mark II is coming later this month. Included is the much anticipated 24 frames per second video, and a change from the 30 fps video rate to the TV standard 29.97.

When available, you can download the update here.

From Canon:

In addition, audio capability is enhanced for professional use, adding manual audio level control, and increasing the audio sampling frequency to 48KHz from 44.1KHz.

When shooting movies manually, the new histogram display facilitates monitoring, while Shutter Priority AE Mode (Tv) and Aperture-priority (Av) mode offer flexible options for controlling exposure. In addition, Canon has engineered 2.0.3 to improve camera and lens communication when manual sensor cleaning is in operation.