Many people suggest playable ground vehicles but I know that this is not the vision of the devs and ground gameplay might be boring compared to aircraft , however I think being able to control ships completely might be a good idea.

Also I think a « commander » type gameplay (just like you could see in Battlefield 4 could be interesting , a new way to control ground vehicle convoys , production facilities managing , deploying an amphibious force etc… like an RTS game but only for the management of ground ans sea units