1 - B-25 Mitchell will never get in game because developers don't want endless threads about CV-launched B-25's. Never mind that Little Jimmy's buffs went with very light bomb loads and missing half their defensive armament to get off the deck in the first place.
2 - B-29 Superfortress will never be implimented because of similar number of threads for a nuke. Never mind altitude arguments, few buff drivers have the patience to take em that high often enough to matter, and Ta-152's could always get the upgrade to go after them.
3 - A-26 Invader would be FAR more fun to fly than either of them, and actually a buff worth spending perkies on.