If they would take the story boards of the scenes that were not finished when the movie was first released and animate them with the same techniques/animation style as the rest of the movie and insert them into the movie to make an extended edition, I would buy it.
I have seen the story boards and they make the battle of Autobot city and the fight between Optimus and Megatron even better.
I probably own enough versions of this already, although better picture quality is somewhat of a selling point. It looks like most of the bonus features are holdover from the last release (25th Ann?) and some previous features are not mentioned, like the isolated musical score track.