The new content will come with the next installment in the series.
I would not expect the SDK any time soon, and the source code, never, unless you are a hacker.
I suspect the pressure for release of the next iteration is pretty high from the financial backers, so don't count on the dev team pulling people off BoM development to push out an SDK.
We are just going to have to wait to have this theater fleshed out to any greater extent. Once the next title is out and established, then I would think things will open up for community content additions beyond mission building.
Just my opinion.
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Personally speaking, the P-40 could contend on an equal footing with all the types of Messerschmitts, almost to the end of 1943.
~Nikolay Gerasimovitch Golodnikov
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