They did say that the intention was to eventually expand the size of the map in Pharaoh

One plan that we’ve always had since the early stages of development on PHARAOH is to expand the size of our campaign map as a free update, and to introduce even more factions and cultures to the game.

and one has to assume that Greece would have to be one of the expanded parts... But that was the original intention before Pharaoh fell on its face so who knows if that's still on the table.