The way I see it, if HTC keeps producing this game for years to come, there's really no reason to not expect darn near all of the planes they can find data for to be included in the game... Eventually.
I personally don't think they're going so slowly about it, either. Yeah, no new stuff until CT is done, but just since AH2, let's look at what new stuff we've got:
P38G
P38J
Me109G14
Me109K4
Spit VIII
Spit XVI
Ki84
B24
T34
P47N
There's 10 new toys (ok, some are pretty close to what we had already *109s* but they're new nonetheless).
Then, of course, you have the remodels:
P38L
P51B
P51D
Spit I
Spit V
Spit IX
Spit XIV
Me109E
Me109F
Me109G2
Me109G6
B17
P47D11
P47D25
P47D40
Fw190A5
Fw190A8
Fw190D9
Fw190F8
That's 19 (plus or minus one or two that I'm missing or got wrong)...
So 10 new toys and 19 remodelled ones in the roughly two years since AH II went full-scale.
How many new things did we see in any two years of AWIII?
Absolutely none.