The long-awaited free add-on content for Portal 2 has been in the works for what feels like a long time, but Valve has reassuring news on that front: it's hitting Xbox Live, PlayStation Network, and Steam next month. And by "next month," I mean October 4. That's this Tuesday!
The "Peer Review" DLC is spread across more missions for P-Body and Atlas, and hey, GLaDOS is in there too. There are also leaderboard-centric single-player and co-op Challenge Missions.
I can understand someone saying that September is still technically summer, but October? Not on my watch, sir. Although it's Portal 2, and it's free ... so I'm just going to shut my mouth so we can continue to receive nice things. Nice things like more music from the soundtrack.