The art cover is also official,,,,I don't know if it has been posted or not ,,,but here is the news:
http://www.ps3fanboy.com/2008/06/24/transformers-on-blu-ray-revealed-and-dated/
It ahs addition of truHD 5.1 audio compared to HD-DVD version,,,,,Other features include audio commentary with Michael Bay, two four-part documentaries, a featurette, still gallery and trailers. It will also be BD-Live-enabled with details to be announced later.