Below is a an updated list of all changes to Torchlight:
February 3, 2010 1.15
Patch 1.15 includes 5 new challenge room maps to test your bravery and wit! New players can now obtain these maps as rewards for completing various quests from Vasman in Torchlight. New challenges await in the Tomb of the Awakened, Estherian Ruins, Dwarven Fortress, Molten Prison, and Black Palace.
November 6, 2009 1.12
Torchlight 1.12 Patch Notes -