I think I remember reading from the developers that there's not going to be a sale on SoG until well after the game is released. They didn't even really want to sell the game to begin with in beta, people just kept pestering them to buy it. They only want people playing SoG in it's current state who really, really want to. Going on sale invites in people who were on the fence about it, which probably leads to negative reviews when it doesn't wind up as complete as they'd have prefered. I could be wrong on this, though.