I like this idea. Hope they pick up on it. And if it does become a thing, I hope they have the PvE kit, but PvP stats (so everyone's on the same ground) to really give it the feeling of you adventuring to a dangerous place, using whatever you have.
Question: Would the instanced area be server-wide or datacenter-wide? I think it should be datacenter-wide like the Battle Halls so it's not always empty and lacking in activity.
Having PvP-specific FATEs like a mini-frontlines would be cool. Like whichever party/faction/whatever has the most amount of kills gets a higher rating. For example, parties with 20+ kills get Gold, 10+ Silver, and anything less Bronze. And they could reward with Wolf Marks or PvP-specific materials (to craft furnishings or something) to exchange.
That's a good idea for sanctuaries; let it have like a 5s vulnerability cooldown when you enter and afterwards, you get the vulnerability buff that makes it so you can't be attacked.
