The following is the (probably incomplete) changelog for Update 1 which will be releasing on October 4.
Major features include
- Multiplayer!
- All-new scenario editor which allows the player absolute control over the world
- New Scenario: Battle of Armageddon - 1405DE
- All-new nicer looking tooltips with icons
- Naval experience multiplicatively increases fleet attack and HP
- Traditions
- Faction system overhaul
Other changes
- Around 100 new regions added to the map outside of the Domain
- 4 New levels of technology
- End date moved from 1400 -> 1600
- Cohesion now drifts upward at a static rate of ~.25/year
- Energy production increased doubly by development
- Updated tutorial tooltips
- Load custom flags for the scenario editor!
- Rebalanced naval professionalism reform
- New Resource: Hypermatter
- New Upgrade: Covalence Infrastructure (+20% resource base production)
- Various new modifiers
- Reforms now affected by legislature support
- Republics can no longer pass reforms without faction support
Bugfixes
- Fixed diplomacy bug when loading saves (opinions would change drastically when loading the game)
- Fixed occasional cosmetic bugs over loaded savegames