After its Cosmos SE unveiling at Gamescom, Cooler Master woke us up to a huge teaser, HAF Stacker. This upcoming case from Cooler Master will see it merge its High Air-Flow (HAF) with the iconic Stacker series, in what will be a blend of the roominess associated with Stacker series, and the cooling prowess of HAF series. Cooler Master's teaser ended with a note saying that HAF Stacker will be unveiled at the other big game expo of the month, PAX Prime, and on the 30th.