I will answer your question with two of my own: 1) Does anything really have to change? 2) One old man flash, new Aquaman, Birthright has become Superman's continuity, Luthor is 'legit' again, Batman has shifted away from the jerk that everyone but Frank Miller had grown to hate. Who knows what's going to happen to Wonder Woman. Kyle Rayner is Ion. Martin Stein is part of Firestorm again. Bludhaven destroyed, and Nightwing relocated. Oh, I forgot the question: Aside from the fact that we don't have a multiverse again, what hasn't changed?