I know that some of you may know this already or have heard it etc, and I apologise in advance for that.
In the new content that came with update, the Peer Review levels for the co-op side to Portal 2, there is apparently a new easter egg in which Valve have placed.
There have been people saying that the easter egg is Hoopy, something which can be seen throughout the Portal 2 game. However, due to the lack of response through Valve that might not be the easter egg and it may still be out there for some people to find etc.
I cannot link to the thread I found the information on, as currently Steam forums are down due to Steam being hacked.
Do any of you avid Portal 2 fans have any speculation on what the easter egg may be?
