So are the Climb rules Mearls talked about and the scaling levels of complexity, if we go by your definition. I have this unshakable feeling that we're saying "poh-tay-toh" and "poh-tah-toh".
To all you people who can actually spell dictionary sounding out things, my deepest apologies.
Heroes of Shadow has all that stuff, but it has the impact of a campaign setting if you take all the stuff in it and add it to your game, whereas previous books didn't really impact the game story-wise from their inclusion. Heroes of Shadow significantly changes the story of your game should you choose to include it or any part of it.