Hmm, not sure what you mean by "DCS core" (sounds like a marketing gimmick). I'm pretty certain the DCS executable and libraries contain code from way back (down to Flanker 2.x) ... :D
Back on topic, ED does seem to have the ability now to make (relatively) frequent releases which introduce a new, detailed flyable at a time, as they can now focus on implementing a flyable, instead of having to develop supporting components (like AFM, clickable cockpit...). Time will tell how it works out.