When I found out that the family values fascists at Disney/Pixar had gotten ahold of the John Carter property, I was afraid that this was going to be turned into a great steaming pile of G-rated pablum ( e.g. John Cater would become a CGI anthropomorphic rabbit who travels to Mars on a carrot-shaped rocket to fight comical Martians). While it certainly appears to have been bowdlerized for this PC age (I'm still surprised that they still kept this a period piece with our hero being a Confederate army veteran), it still appears quite watchable.
I'm still apprehensive about the cast. I always believed Hugh Jackman was born to play John Carter and the only actress "incomparable" enough to play Dejah Thoris would be Angelina Jolie. I don't know Taylor Kitsch or Lynn Collins. However, Mark Strong has proved himself time and time again as a good heavy and casting Willem Dafoe as Tars Tarkas (well, his voice and motion captures anyway) was nothing short of inspired--I think that was his voice at the end of the teaser.
We shall just have to wait and see.