Searching for Elwood

I would love to have confirmation that he's making The Places in Between.. that would be fantastic, but i doubt that's the reason for him pulling out of HF, if it's true. After all, don't they usually record the voices around the actors schedule? And if Brad Pitt is taking over as the voice of Mumble ( oh, i hope not..) then there has to be a very good reason why Elijah can't do it. I wonder what it is.