I personally don't want any more air vehicles. I like playing on the ground and not having to look up. Air vehicles vs ground vehicles is hard to balance.
They're going to add, Heavy Aircraft Vehicles (Bomber maybe) and Light Aircraft Vehicles (Jet), the current one we have is a Medium Aircraft Vehicle.
They're most likely going to add APCs too, they'll be Medium Ground Vehicles.
This is some really early gameplay footage, they show off the Jet at around 5:40.