From Planet5D: Alex over at Magic Lantern announced today that the Magic Lantern team has a version of their software that should work on Canon EOS 5D Mark III firmware version 1.2.3 (which is the latest version)
“Not alpha, not beta, nor zeta, just a bleeding edge that happens to work for me. It might work for you or it might not. (note that my standards are fairly high, so what I call bleeding edge, others may call semi-stable or whatever)”
There are significant updates in this version too, like the elimination of the need to mod the boot flag – but Alex also warns there are still issues with portions of Magic Lantern including the HDMI output in this version.