I, too, advocate a full-price Beta release, given that you intend to give people free updates (or to borrow another term from software sales, like Beta version, "upgrade"). And I'll certainly plan on getting one. My Epic game's party "down time" is nearly finished, and they're about ready to go on real adventures again instead of pursuing personal projects and adventure hooks dropped into those events (which is what I've had them doing for the last month and a half or so). I can't help but think that Ascension will spark a whole lot of plot ideas, even if it isn't the "Chronicle" book that talks about actual deity-level adventures.
So bring it on!