It looks like the title of the third Transformers movie will be “The Dark Side of the Moon”. Transformers fansites such as Seibertron.com dug up book titles from Amazon with that name on it, and it looks like it may be confirmed now by Clollider.
What does the title mean? No official clue, but it could be that Bay & crew are taking a cue from the theories that there are massive structures hidden on the dark side of the moon that NASA hid from the public by swearing the astronauts to secrecy and carefully airbrushing the photos of the moon’s dark side. Then again, it could just be a ploy to have Pink Floyd do the soundtrack.