Fix the multi-play,allow user created missions to be flown online and fix the Campaign.Anything beyond that would be icing on the cake.
The ability to import more planes into the game would be nice but I'd be happy,for the time being,with being able to fly the other planes that are already in the game.

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You are what you do when it counts

WOLF

You are what you do when it counts

I will do terrible things to protect myself and all that I've worked for.
But even in your deepest, darkest nightmares you can't imagine the horrific things I'll do to protect my family.