I actually have my doubts that it's true, looking into it my self, but why would people be disappointed?
Almost every movie ever made could be tighter and thus a better experience, all things being equal I'd love to see a movie halve off it's "fat" scenes...(especially westerns)
That being said who knows what's happening here. Either way one can't possibly expect them to be be negotiating weather or not to edit out their expensive cg scenes...if it was shot it will be present.
Even dark knight could have benefited from being 20 or so minutes tighter. That being said I can't blame folks for wanting to spend as much time as possible with something they like.