Release Date Shifts - 'John Carter of Mars' vs. 'Prometheus' in 2012?

Disney has announced a few release date shifts for two major projects in 2012. The first is John Carter of Mars, the epic sci-fi Edgar Rice Burroughs adaptation directed by Andrew Stanton. It was originally scheduled for summer on June 8th, 2012, but The Wrap says Disney has moved it to March 9th. Not a big concern - except that Fox just scheduled Ridley Scott's Prometheus, that Alien-prequel-turned-original-sci-fi project, in that exact same date. Uh oh. Two humongous new sci-fi movies going head to head in 2012?

http://www.firstshowing.net/2011/release-date-shift-john-carter-of-mars-vs-prometheus-in-2012/