The idea of a John Carter of Mars movie is almost as old as the books themselves, but it has never managed to escape from development hell. The first attempt came in 1931 when animation pioneer Bob Clampett interested the Burroughs family in the idea of a feature length cartoon. There was considerable interest from Burroughs and his son, and much preparation took place, including the creation of a test reel, but interference from Studio Execs destroyed the project. Several other attempts have been made since, most recently with Paramount pictures. The project even got as far as working through a number of potential directors. Word now comes that since Paramount have dropped the property, there is interest coming from Disney, who see great franchise potential in the project. This is very much breaking news (rumour might be a better word) so take it with a pinch of salt. See
tmz for the breaking story.