Portal 2’s free DLC arrives next week

Remember the free DLC package that Valve promised for Portal 2; well, it’s on its way.
Going by the slightly ominous name (given the context) ‘Peer Review’, the add-on will furnish Portal 2 owners with a brand new co-op campaign, single and co-op player challenge modes and a few leaderboards.
Bumbling bots P-body and Atlas will be returning as the playable co-op characters, and they’ll once again be going up against GLaDOS in some fashion.
All platforms (Xbox 360, PS3 and PC) should receive the update on 4 October.