Roll out!

Click here for the official NEW Transformers theme from the flick, by Mute Math. (Wait for the page to fully download and then there'll be a little link that says "Download File")
I dig it. I mean, it's not the Lion version from Transformers : The Movie, but it's not bad.
If you're still hungry for more Transformers, Animated Toast! has 7 different versions of the theme, including the previously mentioned Lion version.