Honor System should be released in Phase 1

[Eloraell-moon-guard]

BLUE POST!

Classic PvP Content Plan

Since we broke down the six phases of content that we’ll be rolling out for Classic, we’ve heard the increase in requests for PvP details so we wanted to get you up to speed on our plans there. As was the case when World of Warcraft originally launched in 2004, there won’t be a formal PvP system in WoW Classic at the outset. You’ll still be able to PvP, of course, and there will be no Dishonorable Kills, so you’ll be free to repeatedly hunt down every player and NPC in, say, Stranglethorn Vale …

Honor System in Content Patch 2
Battle Grounds in Content Patch 3

Just like Vanilla.