According to the post, the highlights are:
New QoL (Quality of Life) Features:
Enhanced Unit UI
Lockable gates during construction
Enhanced tooltips for unit icons
New Mod Validator
New Challenge Scenario: Mangudai Madness
Bug fixes based on your feedback
Pathfinding and Formations fixes
Balance changes
Oh agree. You get 8 campaigns I think. But the dome ones aren’t even the original. So I’m confused about it being original at all