Wings of Glory is now scheduled to release this month, January 2012, and pick up right where Wings of War left off with a WWII Set 3 (8 new models) and new WWI bombers set (4 new models).
In addition, they are releasing a new deluxe starter WWII starter set.
The other issue that concerns me about AA20 is the fact that it was recently announced that key members of the design time were laid off right before the holidays. In my mind this creates doubt for the possibility of future expansions for AA20. Sure there is the possibility that the game designers can be hired back as free-lance contractors, but announcing they were let go 60 days prior to the release of a new line does not give most alot of confidence.