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I'm speculating here, but there were a lot of reasons the first expansion 'TBC' introduced a lot of old world gaps, like not using flying mounts, and having to change from % to ratings. Many of the original mechanics weren't designed with scaling in mind. With one expansion under their belt, I would expect the next one to not to need to change the fundamental mechanics as much, since they should scale to 80 just as well as they did to 70.
Flying mounts could not be used in the old world unless they redesigned the game geometry to be less of a Potemkin Village. I would expect them to design the new zones to accommodate flying mounts, like they did with Outland.
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