Dunno. It just feels to me like the Harronir plot point was scrapped (for now) because Rootlands was cut (probably for being too much like ED too early after DF), but the cinematic was already in production so they couldn't just scrap Orweyna.
All of the Harronir elements in the expansion seem incredibly, incredibly underdeveloped to the point where you wonder why they even put them in there to begin with other than being like "Uhm, we will show up sometime I guess!"
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Rune magic has been a thing since Wrath.