Exclusive content is beyond retarded. Everyone is paying the same price for the game, give them all the same experience. Of course the physical stuff like artbooks, statues, and that kind of stuff is pretty cool. Pay extra money and get a nice bonus, but exclusive in game content is idiotic and nobody should ever support it, which we can easily do by not pre-ordering shit.
I was told that it was a timed exclusive and that all players will get the special preorder skulls eventually.
Everything seems cool minus the exclusive skulls. Unless they do what New Vegas did, and make all of the Pre-order bonuses available for everyone with a small payment later on.