Necro'ing a bit of an older thread here, thought I had responded to it way back when, but skimming it quickly, looks like I didn't.
Greater faction differentiation where different factions do different types of damage (fire, cold, electrical, arcane, poison, etc.)
All existing DLC would become available for it and your current DLC would be added to your account (you wouldn't have to rebuy any DLC).
Different Tech Tree per major faction
Lots more unit customization items
General diplomacy overhaul
Any chance you could make the dynasties an on/off option in the game setup? Love the rest of the stuff included here.