The most notable feature in this frame is that the webcam holes remain. The holes appear to be a slightly different style and dont seem to allow one of the currently used iSight modules (such as in a Unibody Macbook) to fit snug into the hole. It, however, seems strange that multiple versions of this midboard frame have the webcam holes when no currently known model includes a webcam.
Generally manufacturing companies that have two different revisions of a product will try to save money on production by using interchangeable parts, but from the looks of this so far, all of these prerelease parts are being made to house hardware that is not available on any model. This could be attributed to either a late minute announcement that will have people pulling out their wallets, or it was a last minute design pull. (The fact that the camera holes made it from supposed prototype to final revision could possibly support some type of late announcement theory .though we seriously doubt it.)
Read More [via Harvey]