Included 14 new achievements, as well as two new gemcracks with eight new spells. Added a ton more dialogue and quests into Ch.3, plus a new bedroll item that lets you rest anywhere, and some nifty little hats you get from killing rich people that do nothing. Also, you can now craft instruments with Woodcraft ability.
Complete list of changes:
-14 new achievements (most can't be unlocked yet).
-New gemcracks: Phytomancy, Mycomancy (placed in Ch.3).
-Improved gemcrack scripts (translation, info, spells).
-Added merchant, new side quests, and dialogue to Ch.3.
-You can now craft instruments with the Woodcraft ability.
-String and rope are now crafted with Naturalism ability, not Sophistication.
-Improved foraging in Naturalism ability, check failures now reset script instead of exit.
-Added more party chime-in dialogue that affects your relationship in both Ch.2 and Ch.3.
-Chapter 3 townspeople now discriminate against Dustbiter if he's in your party.
-Fixed possible bug with importing party automatically after finishing chapter.
-New items: hats (1-3), bedroll (rest anywhere if all party members have one).
-New instrument sounds and music track by Sonic Kitchen.