A new article discussing the 3D after-effects of Avatar might have revealed when another anticipated project could get started. The Daily Beast recently ran an article which seems to indicate when Cowboys and Aliens starts shooting.
The Avatar factor could make the difference on Cowboys and Aliens, a DreamWorks project to be directed by Jon Favreau that starts shooting in July. (Plot line: Settlers and Indians put aside their differences when a spaceship crash-lands in their town.)
The context of the article could suggest that they're leaning towards filming Cowboys & Aliens in 3D, but, of course, nothing has been confirmed at this time.
We'll be sure to keep you posted on any and all Cowboys and Aliens news as soon as more information is revealed.