humble ...
From what I was told and from my understanding, you have to consider AH II as a brand new Sim Engine. This new sim Engine contains - a New terrain component - a New Flight Model Component - a New Damage Model Component - a New etc ..
This new Sim Engine (AH II) will be used for both ..
AH II "Classic" - This is what we now call the Main Arena. The gameplay, at least to start, will be exactly as we have it now.
AH II "Tour of DutY" - This will be a brand new Arena. The gameplay will be far different from the Main Arena and it will continuously run scripted missions.
The "new" market that you speak of will gravitate to AH II TOD. HTC is banking and hoping that this new arena will bring new money into its pockets.
AH is not being "phased out". I am sure that you will find that there will be a healthy participation in the AH II Classic Arena that will keep it very viable and profitable for HTC. I know that I will be spending most of my time there.
With both arenas using the same Sim Engine, if any new planes are introduced ("bones" as you call them) they can be easily introduced into both Arenas without consequence.
I don't believe that the old game will support the development of the new game, I believe that it will be the reverse. Any new benefits developed for TOD can easily be incorporated into the Classic is HTC so desires.
You have to look at this from a programmer's point of view. I am sure that Dale DOES NOT want to maintain 2 sets of code. If he were to split Classic and TOD, then that is what he would have to do, and it is a nightmare.
The way he explained it to me, is there is one set of code and that set will handle both TOD and Classic. TOD will have an addition module (that Classic won't have) that handles the scripting and running of the scripted missions. I would also believe that he might have a different scoring module for TOD than Classic but the real guts of Aces High will be one set of code.