The artifact knowledge will take up to 5days on live, which will increase the ap you gain from (almost) every item. You start from 25%->50%->90% etc and this will increase up to 24900% gain from items.
You can see a rough overview on how this shit works, keep in mind that unless you do world quests, hc dungeons, and you complete suramar (which most of you probably won't do), ap gain might go slower (haven't tested the ap gain from pvp yet).
funny how this seems like such a large increase, until you realise it takes 125 days of grinding world content and waiting for missions to complete to reach the end point, while your artifact trait costs are increasing exponentially and much faster at the same time
This will be essential to be geared optimally for PvP?