We've had aircraft before in the past, the main problem was the aifield taking up a huge ammount of space, but you never know what time may bring.
The version after v2.0 will most likely contain:
-A new base defence for each side
-More civilian Structures
-1 - 2 more vehicles per side
and of course, any bug fixes needed
we've dabbled with making the marines different factions before, torns got a screen of some space wolves somewhere, but we'll have to wait and see if it actually makes it in game or not.
If anybody wants to, after what I guess would be v3.0 we might release the source files for OW containing everything we've ever made for the mod so that people can touch them up and carry on the OW legacy, that all depends on how bogged down we become with OW2, as if we're not tied up too much with it, then we'll just continue with OW like we are now