Valve's next game not an FPS?

According to comments made by Valve's Design Manager, Robin Walker, at the Digital Interactive Entertainment Conference in Kyoto, Valve is interested in developing games other than first-person shooters. They are working on a
"cooperative building game" where players could build "something like a space ship or a machine with people online instead of shooting and killing each other."

So there won't be any guns, G-men, or headcrabs? I don't understand...