While they have made great sims A-10, Ka-50, the core engine they are using is enhanced old cpu centric Lock-on code - running on one core (except sound engine). There are high res mods for better eye candy but it takes highend pc to run those. On average pc DCS still looks like Lock-on.
About DCS world - as i understood it will be possible to create 3rd party ground veichle / ship / infantry simmulations using SDK - so will this be a Outerra competitor? Not sure if flight sim engine will be efficient way for realistic ground operations.
Even with all negativity i still belive in ED as one of few hardcore sim developers.
Who knows maybe ED team in future will addapt Outerra as core engine.