I think there's a limited number of aircraft left to do that would get used a lot in the late war MA. For the US, the A-26 Invader and the B-29, fighters are pretty well covered. For the LW the Me 410, He 177 and even the Hs 129. For the RAF, the Meteor, Beaufighter and the glass nose Mosquitoes. For the Soviets the Pe-2, Tu-2, Il-10 and Yak-3. For the Italians there is the G.55. I think we already have the only Japanese aircraft that would see a lot of use.
For scenarios there are too many to mention, but mainly we need some early war bombers like the He 111, Wellington, SM-79 and Betty.