If you already have a key, you can use it after 6.0. However, players after 6.0 cannot acquire these keys. In the Hall of the Thunder King will be changed to a Legacy Feat of Strength and not required for the Stormbreaker meta.
Today, September 30th, is the last day for you to log on a character for your Warlord's Deathwheel! Do keep in mind that only your Horde characters can use it and the Alliance version, Champion's Treadblade, will be available at a later point.
Click on the image to view its animations in our 3D Modelviewer!