New tomes in next patch which will likely mean poetics are gone.
I don't see this happening yet. Since the holidays there's probably still a lot of relatively new amount of players without Heavensward Access. Usually the way things go the old one is removed and the new one replaces the old currency. So most likely Law will be replaced Eso will replace it and the new currency will replace Eso. This seems more likely than just removing poetics and replacing it with law which wouldn't make sense. Since poetics really only exists for people without expansion access.