There is a strange preview article at Primotech that is probably based on the beta version of the game. The author is a complete HoMM neophyte who says things like "you probably need a degree in finance just to trade gold for ore" and "this number is actually the number of creatures of that type you control." While he certainly won't teach you how the game is played, his impressions are probably similar to the thousands who will try a Heroes game for the first time in a few months. The article includes some ludicrous suggestions, such as mentionning a switch to a typical hit point system as a necessary improvement, but it also contains some good points about the areas where the game might be lacking. Have a look here.