I have to agree, I think MGM still needs a little something, and they had better do something for AK. EE is a good start, and they've got a decent beginning, but they have yet to give it that Disney Magic.
I think another park would be an awesome idea, but I don't think a "Thrills Park" is the way to go. The thrill rides are a part of each park. Perhaps a Medival land, Or a park that traveled through history. It could be a tie in with POP. THey could take the themes backwards in time at the Resort. You could have the characters as the Three Cabelleros, Three Musketeers, and so on.
Just my thoughts