Thread:Vannesira Smith/@comment-33909829-20160114120027/@comment-26581666-20160114120330

Basically, everything in-game or in novels is canon lore, unless retconned or stated to be otherwise (such as the technology levels and some of the Cata Forsaken questlines)

The RPG, on the other hand, is non-canon, meaning that it is -not- lore and on the same level as fanon, meaning it can be contradicted in roleplay and will be quite often contradicted in game. It's on the same level as any other non-blizzard source, it isn't WoW lore unless they specifically state it is.