If you don’t want to wait for Canon’s update, have a look at Magic Lantern’s firmware.
http://www.petapixel.com/2012/10/23/canon-5d-mark-iii-to-receive-major-video-and-af-upgrades-next-year/#disqus_thread
While it’s good Canon is releasing updates, I often wonder why they can’t just make it awesome right off the bat.