This update is about adding a long awaited new content called Rat Tales.
This is what was added (according to the announcement post on steam)
Quoting:
- New events: Including a rat-centred tale, a Thea dating game and an invasion of foreign wizards and their flock.
- New Rat classes: Just when you thought there’s enough rattiness in Thea, we give you the Tsarat, the Warrant, the - Healrat, the Mystrat, and a cute, little baby rat!
- New Human class: The Berserker, a wild warrior whose power is gained from Destiny.
- New Dwarven class: Ever wondered what dwarven women do in the depths of their underground kingdoms? The - Matrioshka answer that question and show just how powerful they are.
- New characters that can join your group: Gnolls, Polar Bears, old magicians...
- New pets to discover; eight new additions to our Thea menagerie
- New god Trait cards
- The Memorial Grounds: Finally, the many deaths and/or abandonments of Thea’s heroes are now recorded for posterity.
Also included in the update is an important fix to the multiplayer mode, so now you can enjoy Thea 2 with friends again!
As for the build versions: this build version changes were also done before. You can check it here:
https://www.gogdb.org/product/1582025844#builds