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I'm concerned about this too. The article in SpaceRef (http://www.spaceref.com/news/viewnews.html?id=383) discussed some possible tension developing along these lines.
"While Zubrin had made repeated references to his desire for the Mars Society to participate in this mission (presumably with Musk's financial support), Musk was curiously silent in that regard. Only when asked after his formal presentation by an audience member whether the Mars Society would have a role, did Musk address the issue - or even mention the Mars Society"
I would hope that this project doesn't become jeopardised by a clash of egos. Efficient collaboration is going to be extremely important in the future for getting privately financed missions to work. Let's all cross our fingers.