If the spoilers are correct (the haven't been confirmed as true yet, other than the pics), then Itachi's got another trick up his sleeve, Susannoo. If it follows Japanese mythology (like Tsuikuyoma and Amateseru have), it will have something to do with/be released from his nose. Also it should have something to do with a storm or the sea (Tsuikuyoma is the god of the moon, Amaterseru is the god of the Sun, Susannoo the god of the sea and storms). Being released from the nose sounds kinda lame to me, but I'm very curious to see what the jutsu actually does.