I can't remember how it was in Legion but I am willing to bet when the Mythic and LFR wing comes out for Azshara's fight we might see something like the Argus planet in the skybox or something like it. Just my speculation.
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I believe Argus showed up for you personally once you did Tomb of Sargeras - it showed up for everyone, whether they did KJ or not, once the final wing of LFR was released. So if it's following those rules, the people who beat Azshara should see something if there was something.
Okay, I couldn't think of what it was since it was so long ago. But maybe there will be something for later like it probably in 8.2.5.
