I'm into British 1/48 post war aircraft so anything new in that field is good for me but a couple I would like a special mention for would be for;
Scout/Wasp, virtually 2 kits from 1 & loads of markings to choose from.
Vampire/Venom, with intelligent design, 4 kits from 1, Vampire fighter, Vampire trainer, Venom fighter-bomber & Sea Venom with a wealth of markings available.
Whirlwind Helo, not one kit (apart from the even more ancient than me Revell S-55!) exists of the venerable Whirlwind, & an untapped supply of versions could be made from a basic mould with interchangable noses & tail booms in just British versions, let alone the original American versions. I believe this could be a real money (rotor!) spinner both sides of the atlantic!
I also do 1/72 for the larger aircraft in the same period so a few special mentions here would be;
VC10, perfect compliment to the V Bombers & Nimrod (a Tristar & Voyager would be nice too!) plus civil versions.
Comet. this could be interesting as not only military & civil versions could be made but could be the basis of a new more accurate Nimrod.
Lincoln, maybe a bit of an outsider but may be able to utilise some bits off the Lanc to keep costs down.
E-3/ Airseeker. I know they can't use the old Heller kit anymore but a new kit would be nice although may be difficult as the C-135/7 have different dimentions.
If a thought was given to VC-10, Comet,,Tristar & Voyager, how about a Boeing Poseidon, again with civil versions (& maybe Airfix could become the home of 1/72 Airliners, just a thought!!!).