Since the engine for the game is going to be the same one as AOE3DE, an idea came to mind.
I think it'd be a good gameplay twist to add something similar to the AOE 3 card system. Depending on the god choice, new technologies powers and units could be sent from the "metropolis" (Could be Olympus in the Greek case, Asgard on the Norse one, Othrys for the Atlanteans...) in exchange of the favour resource. Of course, mythological units and their upgrades could be still be trained and developed in the temple. But by implementing this system, more exclusive powers, technologies and units could be added to the game, greatly enriching the gameplay in my opinion.