and what if there is no rumors about the vamp castle?
alot of people are going to be waiting for a rumor that might not even exist.
beth needs to put out more info about how to join the vampire side.
C'mon, don't worry about it... there will be some mechanic to present the needed information to the player.
imo the more subtle the better, besides we've all seen the trailer, we all know which biomes to nose around in if we really want to track it down.