I like the above suggestions, but what I would like to see is some fleshing out of the current set. I think HTC could do an entire release with nothing but a whole bunch of variants. They wouldn't have to do much modeling, just some FM tweaks and new skins.
Off the top of my head these "easy" additions could include:
Spitfire Mk. I
Spitfire Mk. XIV
Seafire II
Bf-109E
FW-190F
B-17F
Ju-88
P-38F
P-38J
A6M2
A6M3
F4U-1A
C-47 (russian, japanese variants with defensive armament

)
La-7
P-47M
F6F-3 and F6F-5 (not sure which we're getting 1.05)
Some more extensive graphic modeling would be needed for these:
P-47C
P-47D razorback (including P-47D-23, the ultimate razorback :cool

P-47N
P-51B
A-36
Any other significant variants you can think of?
[This message has been edited by Sancho (edited 12-08-2000).]