Not really, though you should check out the official ubi forums for it. IL-2 is not moddable per se, BUT you can find a lot of very good skins for it, along with some very nice user-made scripted campaigns. Otherwise most of the IL-2 data is closed, which means you'll find nothing like realism mods, add-on units or new maps, because they don't exist.
If you plan to play random/dynamic campaigns, I highly suggest you get IL2DCG however, a sort of SHIII Commander of IL-2 campaign generation (as in, a real must-have):
http://www.lowengrin.com/news.php