Here's a quick rundown by comparing the beta to live patchnotes through a diff tool, sorry for the poor formatting:
- Core Planets is now Core Systems instead. This means you can colonize multiple planets in the same system without it affecting the soft cap.
- Pops receive a -10% happiness penalty while the empire is in an offensive war
- Added Regulated Xeno Slavery policy option
- Only Collectivists can now enslave their own species #New - Traits
- Added Fleeting trait that reduces leader lifespan by -15
- Added Deviants trait that increases ethic divergence by +15%
- All Pops now have a base War Happiness of -10%
- Emergency FTL cooldown increased from 12 to 30 days
- Xenophilia effect on happiness reduced by 75
- Frontier Outpost mineral cost increased from 100 to 200
- Frontier Outpost maintenance cost increased from 2 to 3 < * Slavery Tolerance reduced from +50% to +33%
- Slavery Tolerance increased from +50% to +100% < * Alien Slavery Tolerance reduced from +50% to +33%
- Alien Slavery Tolerance increased from +50% to +100% # Traits
- Nonadaptive trait Trait Points cost changed from -1 to -2
- Very Strong trait Trait Point cost reduced from 4 to 3
- Weak trait now also reduces mineral output by 5%
- Venerable trait effect on leader lifespan reduced from 120 to 90
- Crystal-Forged Plating effect on Hull Points reduced by 25%
- Databank Uplinks base cost reduced from 900 to 240
- Improved Databank Uplinks base cost reduced from 1800 to 900
- Specialized Combat Computers base cost reduced from 480 to 360
- Extended Combat Algorithms base cost reduced from 1500 to 1200
- AI-Controlled Colony Ships base cost reduced from 1200 to 900
- Self-Aware Colony Ships base cost reduced from 1800 to 1500
- Self-aware Logic base cost reduced from 1200 to 900
- When colonizing a planet, the player is now propmpted to name the colony. A name is suggested by default.