1CGS/777 Studio has published patch 2.006 for his Battle of Stalingrad series. The long awaited patch bring Direct 11 into the game, which should really improve FPS in heavy scenes. It also brings two new planes, the BF-109 G4, and the Ju-52. It also introduce a campaign DLC system comparable to what we are used to see with DCS.
Further information in the official website : https://il2sturmovik.com/news/269/update-2006/