I’m very exited with the latest annoucement of Age of Empire Definitive edition. My first improvement suggestion would be to add more naval units and improve Naval AI & stratey. So fun to mix land and water units in the battle ground 
They’ve said on a couple occasions that this is a remake, and they want to keep to the original as much as possible. Sorry, that means no new units, naval or otherwise. However, they are revamping the AI, path finding, etc.
Hope that helps, even if it wasn’t the answer you were looking for.
Ok thank you for the clarification! I wasn’t aware of this. I’m still very excited to play.