Well it may not be Taylor Kitsch in costume or a Thark but the unofficial John Carter of Mars movie site has posted up some pics of the outdoor sets in Lake Powell, Utah. You can see all the pics at http://www.johncartermovie.com/cgi-bin/archive.pl?COMMAND=showarticle&num=0. Maybe with Thor now shown, Disney will get over their paranoia and release some good official pics soon.
Elsewhere IO9 posted an interesting piece on the possible problems adapting vintage pulp material in this day and age and how it could affect John Carter, especially with the political correctness police http://io9.com/5479855/can-you-update-pulp-science-fiction-without-being-f+ed-up?skyline=true&s=i.
Finally Dark Horse Comics has moved up the release date of their John Carter of Mars: The Jesse Marsh Years collection. It will be coming out this Thursday May 5 (I only found out yesterday when I received an update from Amazon.) You can see some examples of the book at http://www.darkhorse.com/Books/16-381/Edgar-Rice-Burroughs-John-Carter-of-Mars-The-Jesse-Marsh-Years-HC by clicking preview on the page.