Of the original IL2 series, the latest is IL2:1946 with somewhere around 200 flyable aircraft and maps from all the major combat theatres of WW2.
The absolute latest is IL2 Sturmovik: Cliffs of Dover. Cliffs of Dover is a whole new game engine, not a continuation of the original series. It demands a considerably more powerful computer than IL2:1946 for good performance and is (currently) limited to the Battle of Britain theatre and planes.
You can fly JU 87 Stuka dive bombers in either IL-2 1946 or Cliffs of Dover, but as Tully pointed out, to fly anything in COD you will need to have a top of the range computer as the graphics are very demanding. have fun. JM.