Modding Support:

Steam Workshop support has been added! You can install mods directly from Steam, and enable and disable them in-game.
​Translations can now be distributed as mods. See sample mod here.
Many modding API additions including access to world gen, brains, cookpot recipes and more! There is a full list of these changes, as well as other mod-specific changes, over in the modding forum.

World Generation:

New Level: The Ruins!
The abandoned ruins of a once great civilization is now in the second level of the Caves.
Discover the cause of their demise while you explore five new areas within the ruins.

New Creatures:

You will come across ancient clockwork monsters in the ruins.
The terrifying Ancient Guardian lurks within the labyrinth.
Beware of ambush! The Dangling Depth Dweller spider has been added.

New Items:

New crafting tab: Ancients!

Discoverable Items:
Thulecite
Slurper Pelt
Green Gems
Lichen
Broken Clockworks
Relics
Statues
Nightmare Lights
Ancient Pseudoscience Station
Pillars
Ornate Chests
Thulecite Walls
Wilds Pond
Craftable Items:
The Pick/Axe: Dual functionality!
Magiluminesense: Light the way while keeping your hands and head free for activities!
The Lazy Explorer: Don't like walking? This staff is for you!
Construction Amulet: See all the inefficiencies in your crafting.
Thulecite Medallion: Track the ebb and flow of ambient magic levels.
Belt of Hunger: Keep all that important food inside you!
Thulecite Suit: Protection from things hitting you.
Thulecite Club: Hit things!

Screens:

Keep track of your deaths in the new Morgue Screen.

Changes

Walls have been removed from the cave levels to improve the gameplay experience.
Splumonkeys and Slurpers have ventured further underground and taken refuge within the second level!
The Gemology tab has been removed. Items from this tab are now either in the magic or ancients tab.
Orange and yellow gems no longer drop from stalagmites and earthquakes in level 1 of the caves.
Slurpers no longer drop beard hair.
The cost of the Prestihatitator was adjusted.
Cleaned up the main menu by moving many of the buttons into the "Options" sub menu.
The camera now rotates in 90 degree chunks again.
Added more bindable controls.
​There is now separate action and attack buttons.