Bugs/Gripes post-patch 1.1 so far:
-No save function
-All anvil improvement for a unit is reset when a unit is trained
-Random anvil upgrades
-No surefire way to choose from all the classes from the school, retrain, or sacrifice units to get a certain class within the current spawn limit
-Units sacrificed on the dark altar do not vacate the spawn pool, and may not be replaced
-Worldwide unit upgrades don't apply to units that spawn after the upgrade purchase
Lastly, I want to say thanks to the developers for this is a fantastically fun game! It's downright scary how much time disappears when I play it.