http://www.pcgamer.com/blizzard-is-ditching-wows-pvp-servers-for-an-opt-in-system/

World of Warcraft's next expansion, Battle for Azeroth, is all about reigniting the Horde versus Alliance conflict. In that spirit, Blizzard has announced sweeping changes to its World PvP system and the elimination of PvP-only servers. Game director Ion Hazzikostas revealed the changes during the World of Warcraft panel at BlizzCon 2017.

"Our ruleset doesn't necessarily make a ton of sense for how the game is right now," Hazzikostas said, explaining that since 2005, the rules governing open-world PvP haven't really been updated. That's set to change with Battle for Azeroth.