They have a new item deletion code, if it says WF, and it has 6 sockets, the code will detect it, and delete it on the spot, all items will have new codes, no mass dupes for a while.

And with the ladder being swiped every 6 months, if a mass dupe comes on ladder (even then, no one will have anything worth duping) you can just wait for next season. Thats the beauty of patch.