RoTF Soundtrack Special Edition?

Amazon has a new listing a special edition of the Transformers: Revenge of the Fallen soundtrack. The CD will be released on June 23rd and costs $22 rather then the $15 of the the standard edition. Exact details on what makes this "special" are currently unknown but usually these things include a few additional tracks or an extra CD or DVD with videos and the like on it. More details will probably be released as get close to the release date.