Well, apparently there are 11 flyables confirmed (without counting the "probables" and variants).
I don't remember exactly, but I think it's about the same number of flyables we had when Il-2 first came out.
Considering it will receive expansions just like Il-2, my guess is we'll probably end up with the same, if not more planes than we currently have.
Oh yeah, the plane I want to fly the most... Well, for the sake of old-school fighter style, Spitfire.
To be more precise, doing a slow roll over the airfield in a bright summer day