In other words you heard it was in the Middle Ages and stopped following development, I take it?

Just a few of the differences we know about: manned walls, building fires, hunting Scouts, ambushes from forests, hero units, unit abilities like cavalry charges and pike formations, asymmetric factions (peaking at the Mongols having mobile bases--please take notice, Firaxis), greater attention to historical accuracy (no more nonsensical "Britons")...So yes, from what we know while it's certainly recognizable as an Age of Empires game, it's not just a graphics update. Also I very pointedly used Civ2 as an analogy. AoK came out 22 years ago.