The new Weighted Consecrated Sharpening Stone can’t be applied to Staves.
Update:
Ferals are able to use the new 1H 100AP sharpening stones on the AQ10 1H mace. Unfortunately, our off-hand gains nothing. Thus, ferals are just behind a 100AP every other melee class for Naxx. I guess we could use a 2h mace, but this feels like a bug.