If I can blow my own trumpet for a minute, I saw this “Sylvanas becoming the next Arbiter” idea coming over a month ago, even before the leaks. I even did my own thread about it.
Sylvanas will become the new Arbiter
Zovaal: Elune? Is it… over ?
…
I think that’s the stupidest thing Blizzard could possibly do with Sylvanas (also “conveniently” forever preserving Afrasiabi’s necro-waifu). Doesn’t mean it won’t happen.