It will be. Designing new scenes to enhance 3D. RT: @JimmyinGA: Was looking forward to GI Joe next month. Hope the 3D is worth the wait.
— Dwayne Johnson (@TheRock) May 24, 2012
Others still have read rumors of advanced screenings that didn't look all that great and asked it's audience questions like: "How did you feel about (Channing Tatum) in the film?" and "Do you feel there should have been more of him...?"
It's probably a bit of both. Paramount wants to add the 3D conversion no doubt but that added time also gives them opportunity to address story and characters. Want more Tatum? Done. Want more head nodding to the fanboys? Done. And so on...
I think we will be in for a much better movie in the end, so have at it Paramount!