Fanticipator
Someone who is a "fan" of something that hasn't yet come out. They can't really be called a "fan" technically, since being a fan implies having actually seen or experienced whatever it is they are a fan of. So the term "fanticipator" is much more appropriate
Steve is a huge fanticipator of the film Prometheus.
Fanticipation
The feeling of looking forward, usually excitedly or eagerly, to the oscillating fan swinging back to blow in your direction.
Johnny waited with great fanticipation as the sweat dripped from his balls.