How is the Dawn of X omnibus mapped?

I don’t know if anyone has actually gotten a copy yet, but how does the book map out the issues? Is it one full story arc of each series together (so like X-Men #1-6 followed by New Mutants #1-6 or whatever)? Or is it fully by publication date (like X-Men #1, then New Mutants #1, then Marauders #1, and so on)?