The Legend of Grimrock website now features a countdown timer that looks like it should hit zero around 4:00 pm EDT tomorrow. Developer Almost Human recently announced Legend of Grimrock 2 is in beta testing and that they are working on an iOS edition of Legend of Grimrock, but there's no clue on the website whether this timer relates to either of those games, or something else, but it seems we shall know soon enough. Thanks Steingrimur.