https://www.polygon.com/2018/7/16/17576964/world-of-warcraft-pre-battle-for-azeroth-patch-notes-8-0-tldr

Patch 8.0, more commonly known as the Battle for Azeroth pre-patch, will finally hit World of Warcraft live servers on July 17. Pre-expansion patches are always some of the most exciting in the game; not only do they drastically change up the classes, they give players a chance to quest their way up to the events of the expansion.

The Battle for Azeroth pre-patch brings more changes than usual. With the removal of the Legion Artifact traits, many of the classes have been drastically overhauled. Each class has been more or less overhauled will play identically to how they will on day one of Battle for Azeroth, which launches on Aug. 14. The only thing players won’t have to play around with yet is the Heart of Azeroth necklace and the Azerite gear traits that come with it.