I believe this time around its free. That's what I've read on the official website blog.Piney wrote:Downloable content. You need to connect to Xbox Live or Steam or whatever internet thing you have your Portal on and download it. Sometimes it costs money.
Apparently its supposed to be a new little adventure that takes place after the events of the co-op thing. I haven't finished the original co-op yet because no one in my family will play it with me