Fresh stuff from sukhoi.ru (Discussion)

Originally Posted by cheesehawk

Depends on how they market it, if they release it free as a patch, its the same project. I doubt that's what will occur(<--speculation). If its an expansion, that you pay for, different project. If its a collection of individual planes/maps, that you pay for each part, then I'd say same project again.

It seems pretty obvious that it uses the same engine. That means that any improvements to the code will apply to both projects.