The first installment of Fable II Episodes is available now on Xbox Live -- for free. Think of it as an extended demo for the magical adventure that became the Joystiq Game of the Year for 2008. We have no idea where exactly the first episode ends and, more importantly, we have no idea how much the next servings will cost (we're waiting for confirmation).
Depending on the total price, it may be better to pick up a physical copy of the game or wait for the "game of the year" edition. Don't let the first-hit-is-free drug dealer tactic reel you in while alternatives exist, friend.