All of that said, I don't have any high hopes for a John Carter movie. I don't think it will translate well. People said that about the Lord of the Rings, too, so I may be wrong.
I'm not saying there isn't room for more than one interpretation.
The good news is that many people are not familiar with Edgar Rice Burroughs' literary output besides Tarzan, so this will be an opportunity, if done correctly, to introduce his oeuvre to a new generation. The good news is also that Disney is involved, so at least the film will be entertaining. The bad news is also that Disney is involved; they did make a Tarzan movie, television show, plush tows, etc. that bore scant resemblance to Burroughs' creation. I doubt there was a run on Tarzan's original printed adventures. Kids would find them dull.
A little Frazetta to end this essay:
See you at the theater in 2012,
Image of the Gods of Mars and the second illustration ("John Carter of Mars) copyright resides with the artist, Michael Whalen, and, presumably, Del-Rey Publications. They are used here to show what John Carter and Barsoom should look like. The third illustration is probably copyright Argosy Publications, or whatever conglomerate owns this defunct fiction house now. Likewise, it is included to illustrate a complementary vision of life on the Red Planet. The final illustration is copyright Frank Frazetta. 'nuff said about that.