The title of the Disney film is
John Carter of Mars and it is a live action adaptation that is set to be released on June 8th, 2012. (according to Wikipedia)
There is also a direct-to-dvd movie titled
Princess of Mars that was released in 2009 by The Asylum that stars Antonio Sabato, Jr. as John Carter.
The Asylum is known for making "Mockbusters" which are kind of lower budget versions of big budget movies that are slated to come out from the major studios. The Asylum uses the hype of the big budget movies to, in some peoples' view, dupe the public into purchasing/viewing their sound-alike direct-to-dvd films. For instance, they had a Sherlock Holmes movie when the Robert Downey/Jude Law version came out. They apparently even had a giant robot movie titled
Transmorphers that came out at the same time as
Transformers. So I'm not sure of the quality of the 2009
Princess of Mars, but I do have it in my Netflix instant play queue to check out one of these days when I have time.