In addition to general gameplay and balance fixes, the release -- the game's currently playable in a free alpha version -- will evidently boast an entirely new inventory system with a focus on character class progression and converting weapons when they're worn out. That and "so. much. content."
Pre-orders are open through QCF's site for the standard ($10) and special editions ($20) of the game, both of which offer access to its upcoming closed beta. The latter includes a "commemorative building," extra quests and an addition character class. No longer on offer: a $75 "exclusive edition" that gets its purchasers referenced in-game and their names in the credits.