Maybe they could get some ideas from this.
http://www.theagesofman.net/index.html.
Retaining that CTP2 feel and playability but with many new features and concepts. A new 3D tile file, game graphics, unit graphics, special effects. But also new depths to trade, war, empire management and gameplay. Succession, sieges, supply, elite units, generals, historical heroes, empire and unit surrender, migrants, border forts, outposts to use goods anywhere, capture advances from the enemy, advances from goods, natural disasters, major historical events such as the Dark Ages, Black Death and Hun Horde, and much more. There are now 205 units, 193 advances, 21 governments and 51 wonders. Civilization traits that change with the progress of history. Special governments with special units for the Middle Ages, that are restricted to the Civs cultural/religious type so they develop into different players.
Each era has its own special feel making AOM like 4 games in one and there are 4 different starting ages. For the ultimate challenge, play the full campaign on gigantic map on mainly land and settle in for an epic that is bigger than Ben Hur.
A new aggressive AI that is also a little unpredictable, together with more Barbarians complete the picture of the ultimate Civ style game.