transformers tv-spot: it's you and me

the question that has Trans-fans debating across the board is: *is that Bumblebee's or Optimus Prime's voice, when it growls; "it's you and me (now)"... tis debatable if this be the 6th or 7th tv-spot [via] with the main diff with this one and the previous bad quality is the end-sequence after the credits...version-6 has Sam kicking away Frenzy's head exclaiming: "not so tough without a head, are