It's no secret that some addons, like GearScore, generate a numerical value for the gear of a player or players by inspecting their gear. Other addons also do inspect requests for other reasons. However, as of patch 3.3.5 it appears that the functionality of addons that automate inspect requests will be limited via server-side implementation during rolling restarts.
Basically, the idea as presented is not to prevent addons from inspecting players but rather to prevent them from doing so as often as they currently do, reducing server lag by reducing the amount of inspect requests addons can flood them with. It's important to note that this is being implemented via rolling restarts; as a result addons that you have that currently make use of automated inspect requests might not function properly. Since this isn't aimed at crippling addons that use the inspect feature, it's likely most or all of them will be able to weather the change.