The only thing I can say here is that if, in addition to what we can see in M2TW:
- naval batles are great
- religious matter could trigger the religious civil wars and european wars, and subsequent emigration
- the AI changes a bit to be more challenging for the game veterans

And that in addition, we could choose a form of government, which would of course trigger other warfare events (I just remember France's monarchy being -unsuccessfully- rescued by the surrounding monarchies just after the revolution)

That will probably be one of the greatest games. Ever

I'm just drooling, right now. Ow....