I have also thought about this. What about giving Sumeria or the Hittites to those who preorder? They are already in the game, just not available outside their scenario.
How about some TF2 hats for pre-order!?
Cant tell if your trolling but ill bite. This is a terrible idea lol. I hope its just early access or free DLC.
They aren't in the game. Their name is in the game and so is a unit. There is no leader art, no music, and no voice actor to play them. Considering the amount of work required to find a speaker of Ancient Hittite, this isn't a small addition.