At around 12:10 in the video, as Ion is talking about the Chromie Scenario he says, "Certainly when you're level 112, as we learned in the Chromie Scenario, Dragons will be very important."
I might be reading to much into it, however when you think as to why Blizzard would choose this specific theme if they wanted to add a scenario in 7.2.5. Chromie is popular, but you also see dragons in Azsuna talking about how deathwing's fall effected them so there is some likely set up. And as we also see there is some old god setup in Legion, but I think of it as the old god setup in Legion is the equivalent of Wrathion's warning in MoP, so we will likely have an expansion in between the two major events, and as dragons are connected to the old gods via madness and corruption, it is not that far fetched of an idea to think that they might focus on dragons in one form or another in the next expansion whatever it may be.