Insect hives are dangerous but produce succulent insect jelly
Animals and predators
Many more animals, some of which will hunt people
Some animals are now predators, including colony pets (e.g. cats catch squirrels)
Animals can gnaw corpses apart directly now
Threat response mode
Decide how colonists should auto-respond to threats: flee, attack, or ignore?
Economy
‘Components’ resource used for machinery and electronics
Ground-traveling trade caravans from other factions
Deeper research tree with more low-tech options and more things to research
New fueled buildings: stove and generator
Various new lower and higher-tech production buildings
Two research tables: simple and hi-tech. Hi-tech is required for some projects.
Misc
Character records which keep stats on each character like number of kills, injuries, surgeries, etc.
Extreme desert biome
Colonists in relationships can share beds
New double bed; royal bed is now gold-trimmed and fancy
New flatscreen and megascreen TVs
Colonists can now visit sick people in bed to cheer them up
Sick people in bed can now watch TV
Building damage overlays
Days are now twice as long as before, with years being half as many days. (This means that years are exactly as long as before in actual play time, just divided into a smaller number of longer days.)
The year is now split into seasons instead of months.
Animal kibble
Deep rooms stay cool in the heat
Richer tale recording and better art descriptions
Hundreds of balance improvements, optimizations, tweaks and fixes