I would have to say that the next update, 99.9% guaranteed will include the He-111. So what's after that? I would say please, for the love of God, update the two Junkers. Compared to the new models, they look horrible. They're not a prettiest, or the best, but they badly need it. And seeing how the new Sturmovik is doing with its 37mm cannons, I know everyone wants it, but the Stuka does not need another pair of giant cannons, even if we do get it, no one will use it after 1 day. Why? It have way less ammo, worse handling, and not-that-great armor than the Il-2.
As for the 88, give us a the night-fighter/interceptor version, a G-1 or G-2 would do nicely. If it wasn't for AvA and FSO, you wouldn't see this heap of metal in the any of the MA. You'll probably see 1 or 2 in the Early Arena, but not to great extent.