(If, by some chance, you are planning to attend the Nuke Con game day in June and plan to play in my game, do yourself a favor and don't read this. I mean, I can't stop you, but you'll possibly spoil your own experience.)
Some things I have decided about The Sunken Tower of Tsenophal:
-The true nature of Tsenophal will not be revealed.
-Possessing the Heart of Tsenophal allows you to break the scenario. If you get the Heart, you win. (Sort of)
-Possessing the Heart of Tsenophal dooms your character. (But hey, it's a one shot)
-The Heart will not be at the "end" of the dungeon.
-Some of the pregen characters have goals that have nothing to do with the Heart.
More as I think them up.