Well on the matrix side of things, he's got back Bumbleebee's half, and you can see that it's only half a sphere glowing in his chest.... So that makes sense there.

Really liking the way this is building up, Starscream's plot to make himself out a hero by solving a problem he created, Swindle realising he's been swindled, and Optimus playing the "God" card... This could get really interesting once Prowlestator gets involved too.