Shapeshifter's Chain will work, as will Mighty Chudan and Slimecraw according to the Patch Notes. Keep in mind, there are the lists in the part about PvP Campaign Changes. However, when you scroll down the Patch Notes to the Fixes and Improvements, there is a fourth list of working sets, which contains Mighty Chudan, Slimecraw, and also sets like Rattlecage.
I hope ZOS will provide a consolidated list in the patch notes when it goes live and also some way of giving that information in-game. Is there any in-game notification on the PTS, like greyed out set bonuses or something? I currently don't have access to the PTS.