Which factions you believe should be added or made playable in and expansion?
My guess is they should probably make, Portugal, Denmark, Italian States, Persia , and the Mongols Playable. I would like to see them make Mexico, Gran Colombia and United States playable in a campaign setting.
They should probably add Brazil as well.
To Play With Mongols They Got To Set The Game In 12 13 14 Century.
I would very much like to see a campaign dedicated to the Napoleonic War.
Seems you got lucky eh, your dream has just come true ^^
Personally I'd have liked an expansion to Empire better than a spin-off about Napoleon.
I kinda expect them to make an Empire expansion after that still.