As per the poll's question!

(a) The 4 new Legendary Lords
(b) The new Lore of Magic (the Lore of the Deep)
(c) The new roster (command towering constructs, ghastly pincered sea-beasts, ghoulish horrors and musket-wielding piratical zombies)
(d) The new campaign mechanics, with treasure maps and buiding and upgrading ships
(e) The new island battles and Black Ark battles

Expand if you wish