On the topic of what gamers and the industry may expect from Crytek in the future Yerli said, “We will do a single-player esque experience. But it will be for you and your friends together. Single player with two players! Story-rich experiences for at least two people. The premise I can say clearly is that free-to-play is going to be part of any business model we have going forward."
http://shogungamer.com/news/14490/crytek-founderceo-comments-f2p-future-company

So Crysis coop might happen in the future...