Hola amigos bueno he estado mirando en la pagina creada con el proposito del frimware y dicen que posiblemente hagan un frimware para la 50D ya que mantiene similitudes con la 5D Mark II como reseña en su pagina web

Magic Lantern Firmware Wiki
Will it work on a 40D, 50D, GH1, etc?

Short answer: Maybe. Longer answer: It is likely that the 50D is close enough to the 5D Mark 2 that the same techniques can be applied to building similar firmware. The CHDK project successfully supports many different cameras running different operating systems, but finding the necessary kernel entry points is a very time consuming process. Since the 5D Mark Free software is publicly available, some one with the time, the hardware and the inclination to port it to the 50D can do so. The 40D is similar in hardware, but runs vxWorks and would be lots of effort to support The GH1 is a completely different bit of hardware and would require an entire from-scratch reverse engineering effort. Until Panasonic releases a firmware update it is unlikely that any such efforts can be begun and even then it would require someone with a camera, the inclination and the skills to work on it.

Descartando la 40D ya que usa tecnologia Digic III y OS vxWorks espero que pronto podramos ver la 50D con este frimware Magic lantern para nuestra 50D que aunque no tenga soporte de audio podria grabar video.