Hmm... Well, with the activity level on the server reaching 1000+ people online a day, I really don't think FH is going anywhere, anytime soon. There are just too many people who still really care for it. Not to mention, if the game were to be shut down, it would be made very clear via an announcement on the forums (which, there are none).
Those who might think negatively about FH's future are likely drawing conclusions from the fact that Kov left a year ago. However, we're still here, aren't we? The staff still works hard to keep the game running, and it's still business as usual in and outside the game.
I think what you've been hearing is just like you said-- a rumor, and a false one at that. I don't think we're going anywhere anytime soon, dear.