The War Campaign quests that take players to the enemy continent start at 112, but they won’t be a constant presence there. Because of this, there isn’t exactly a guarantee that you’ll come across enemy players. Factions level separately this time on different continents, Kul Tiras for Alliance and Zuldazar for Horde. If you really want to level extra fast, you can take the chance of flagging for PVP. It’s also a high risk reward for those willing to court danger. It’s pretty much making up for the time spent getting into fights with the other faction. However, the bonus experience is far from mandatory or forcing players to PVP. It’s also lucrative enough to spark interest in those who might not have the desire to try it out otherwise. It’s a nice bonus for players who already like to PVP. PVP-flagged players will receive 15% bonus experience when leveling out in the world and 10% extra rewards at max level from World Quests.
But Battle for Azeroth has a little bonus tacked onto flagging. Not everyone likes to PVP, or has really experienced it. It will also be balanced between Alliance and Horde, solving both faction imbalances and underpopulated servers in one go. Players that flag from all servers will go to their own server shard, where they can PVP to their heart’s content. At last year’s BlizzCon, Blizzard announced that instead of segregated servers, all players would have a toggle to flag for PVP. In Battle for Azeroth, PVP and PVE servers are going by the wayside.