Hircine's Blood Moon. It would be a perfect chapter to release the other Therianthropic beast into the game. Werecroc, Werelion, Werebear, and Wereboar. It would also give a reason to update the werewolf skill line. If not give us new skill lines for the other beast at least give us the option to have a skin for the werewolf. Like same werewolf skill line, but you have to be bitten by one of the other Therianthrops.
Maybe even include a new world skill or weapon skills line (Crossbow or Spear) into the game.Maybe a new class like Druid, Shaman, or Bard. All these Ideas would fit with the whole theme of the expansion. What do you all think would be good?