Depends, did he demand his contract not require that there be a buy out for him to get out of it like Saban's with Alabama? Or did Arkansas only agree to give him such a long and lucrative commitment in exchange for an extremely prohibitive buyout?
The latter. He already has a large buyout as it is, and was prohibited from leaving Arkansas to join another SEC West school under his old contract. As it was, he was already one of the top ten paid coaches in the US. I am hearing he is getting a big raise and restrictions on him joining any school in the SEC East as well.
The UA has also announced plans to build an enormous football facility that Petrino has wanted.
From what I have heard, he and his family love living in Fayetteville and it reminds him of his home state of Montana.