Excerpt
When World of Warcraft: Forever launches GPUs based on certain older graphics architectures that fall well below the game's minimum hardware requirements will no longer be supported. The vast majority of World of Warcraft players already use compatible hardware, and this change will allow us to support the game’s updated visual look while providing a more consistent experience for players.
The first sixty words of the post, as Blizzard wrote them. Read the rest on Blizzard's site.