Major_Setback It is landscape lighting and general lighting that have changed, (and I think the shift to dx11 too?) and these affect the skins.
The colours have changed, and it shows more on some aircraft than others (Ju87 especially) with the new game. No intentional change has been made though, it is a result of the other changes (to shaders etc.).
It is very likely it will change again with TF5, even though no colour change is planned/intended. The shaders will no doubt be changed, and the game lighting altered to accommodate the harsh desert light. All these things alter how the game looks.
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