The first trailer is up for John Carter of Mars, which will be released next year, a century after its first serialization.
It looks awesome, but isn't true enough to the book for my taste:
...just as we neared the throng of Martians I caught a glimpse of the prisoner from the battle craft who was being roughly dragged into a nearby building by a couple of green Martian females.
And the sight which met my eyes was that of a slender, girlish figure, similar in every detail to the earthly women of my past life. She did not see me at first, but just as she was disappearing through the portal of the building which was to be her prison she turned, and her eyes met mine. Her face was oval and beautiful in the extreme, her every feature was finely chiseled and exquisite, her eyes large and lustrous and her head surmounted by a mass of coal black, waving hair, caught loosely into a strange yet becoming coiffure. Her skin was of a light reddish copper color, against which the crimson glow of her cheeks and the ruby of her beautifully molded lips shone with a strangely enhancing effect.
She was as destitute of clothes as the green Martians who accompanied her; indeed, save for her highly wrought ornaments she was entirely naked, nor could any apparel have enhanced the beauty of her perfect and symmetrical figure.
If you ain't gonna do Dejah Thoris right, why do Dejah Thoris?