Just putting here a rough changelog since IVAN 0.58 so far:
Changes
* several hundered new dialogue lines added,
* story of Xinroch added,
* 45 new items, including several artifacts, added,
* full helmets grant sound resistance,
* tin helmets block ESP,
* several potions added,
* two new optional minibosses are generated,
* spider level added,
* improvements to Attnam and its underground,
* more people in Tomb of Xinroch,
* sirens can be generated,
* science talking with more NPCs possible,
* several materials added,
* scaling option for graphics added,
* switch to .png graphics,
* show height and weight of creatures.
Fixes
* assorted balance tweaks,
* fix digging stopping after single turn with NumPad,
* many, many more fixes.