Title self explanatory.
For the slackers who in the previous season didnt really cap any conquest, and saved up a bunch (for ex: 28K)
Now due to a bug have that same cap in the Grievous season, and can get over the 1800 conquest cap in the new season, allowing you to get 28000 conquest points (depending on your slacking) in the new season, getting fully geared in 1 day.
So if you slacked last season, saved up a giant conquest cap, you can now farm arena games nonstop until you have the full Grievous PvP set!
Proof: Trillebårtom @ Sylvanas - Community - World of Warcraft (Check his activity!)
This guy already has the weapon and almost all the armor pieces.
I suggest deleting the items or putting them in your void storage will increase the chance of them not being removed!
Enjoy it whilst it lasts!