Haha, look at this guy still treating the Blood Elf debate like we're in 2012. "Muh Hrode Blud Elfs!"
1. Amirdrassil is in a neutral area already, whether it stays in the Emerald Dream or moves to the Ohn'ahran plains. Horde will be all around it, even if the Night Elves retain some unique little hub inside (we'll see what hapens there). A neutral Silvermoon (at least parts of it) makes complete sense. It's just Blizzard fixing one of the great lore inconsistencies of WoW, one they admitted was created out of the necessity to even out the faction balance in TBC.
2. Blizzard has said this is the expansion to unify the elves of Azeroth. I seriously doubt they'd approach that with your outdated mindset of "High Elves = Horde!111". They will want to do something interesting and give players something they can't wait to get their hands on. Just like they're doing something a little bold in War Within by giving the Horde access to "dwarves".
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Fair points.
I agree, it would be neat with a zone existing in two versions. Although, both the Emerald Dream and the Shadowlands were once said to be sort of... alternate dimensions layered on top of the mortal world. So something tells me the Void will be treated the same and just get its own physical space.
The reason I think they might include the bits around Quel'thalas are these:
1. It gives the Alliance some love, and the Forsaken players that have yet to recieve the same type of reimbursment as the Night Elves are getting for losing their capital city.
2. It makes sense with Tyr in mind, whom I'm guessing will be an active characters for the next few years.
3. I don't see how they can expand the physical landmass of Quel'thalas by too much without making things weird as you zoom out to see the entire continent. Quel'thalas would look way too much compared to the rest. Your idea of adding new Void zones could be a good workaround, though. It makes sense if they want to give us some new flavour.