I hope that we'll eventually see the A-36 and one of the other Allison engined Mustangs but we still have some existing planes that need to be brought up to the current graphic standards and other holes to fill in the plane set.
ack-ack
Indeed.... Ki-61, F4F/FM2, Tempest, A-20/Boston, D3a, B5N2, and SBD-5 all need graphics updates.
However, most of the large holes in the plane set have been addressed. Now, I hope, we'll start to see the smaller holes addressed.
From the Ki-61, adding the Ki-100 would be a smaller effort. From the P-51B, adding the P-51A would be a smaller effort. From the P-38G, the P-38H would require only skins and revised flight model. Adding the F6F-3 (using the current F6F-5 flight model) and revising the F6F-5 to match test data. From the Ju 88, the Ju 188. The Seafire Mk.III would be less effort that from scratch. Likewise, the unloved and unused Mk.Vb should be supplemented with the Mk.Vc (which we had previously). Meteor, Beaufighter and A-26 would all be popular.
I don't expect the P-51A anytime soon, but I believe it'll be added eventually.