GI Joe 2 release date changed because of Channing Tatum?

My most anticipated movie of the year Gi Joe 2 Retaliation was suppose to be out this month but now it won't be out until Macrh 13 2013. Originally I heard it was because they were converting it to 3d but now I hear it is to include more of Channing Tatum? Are you kidding me? You have Bruce Willis and Dwayne Johnson and you need CHANNING TATUM WHY???