The film version of "A Princess of Mars", now called simply "John Carter" has its website up, although there is not much information. Nice background music, though.
http://disney.go.com/johncarter/
The trailer is out today, attached to the Harry Potter film.
Now, as a fan of the stories since I was a boy, I am excited to see it. However, I am nervous as to how Disney have told the tale. The director seems a good choice and he has stuck close to the book.
I know someone who has worked on the film. They stated, without giving too much away, that he gives it a 7 out of 10.
(They are still in post-production, and reshooting some action sequences.)
Rafala