It took somewhat longer than expected, after having been promised for the summer and then a couple more times, but now this fresh new DLC called Portal 2: Peer Review will be released to eagerly waiting Portal 2 fans on October 4 on PC (Steam), PS3 & Xbox 360 platforms. This is a hard date, so there should be no more slips.The DLC includes content for both solo and co-op campaigns. In particular, the story of P-Body and Atlas, the two co-op robots continues in Peer Review "as you puzzle your way through a mysterious new co-op test track and once again match wits with GLaDOS." On top of that, there's a new challenge mode for both single player and co-op, including a leaderboard, allowing players to size themselves up against their competitors.

Finally, coinciding with this announcement, the last of the three soundtrack volumes has today been released as a free download. All 64 songs making up the three volumes can be downloaded from here. Note that ringtones for Android & iPhone devices have been included.

Considering Valve's consistently high quality output, this release is expected to be an instant hit with fans of Portal 2. Can't wait.