Open beta means we're not quite ready for the massive rush of early-access yet. When a game goes into early-access it becomes part of the entire Steam ecosystem with curators, reviews, banner rotations and top sellers lists. So we're keeping a low profile for now until we believe we are ready for early-access.
During open beta, all new players can purchase the game from Steam. We have the final price of the game set for $12.99 USD - one for yourself and one for a friend. However, we are pricing the game at a discount to for people who purchase before launch at $9.99 USD for two copies of the game.