I searched and couldn't find this anywhere.
But for rogues who have duel spec, one for pvp and one for pve, then they could use there prep for both specs.
If a rogue used vanish in there pve spec, then they can active there other spec and use prep. Then hop back onto the other spec and there vanish and other cooldowns are back.
Not a big exploit, but could save a repair bill for some people![]()