For more info on the release build, check out the previous build notes.

AI: Will build radar sooner; also will build teleporters on new planets sooner and send fabbers sooner to uncontested planets.

Engine: Lighting engine work on planet smash.

Galactic War: Adjust boss battle difficulty on Normal
Galactic War: Sub Commanders should appear again, though still rare.

Gameplay: Added the PAX Prime system to the default systems.
Gameplay: Fix patrolling units from stopping after attacking an enemy unit.

Linux: Coherent hotfix for BadAccess problem.

Official build notes