WoWhead recently datamined 10.1.7 items that indicate the anticipated MoP Timewalking Raid will NOT be Throne of Thunder but in-fact Siege of Orgrimmar with Removed items and heirlooms being added back in. :
Mists Timewalking Active - Great Time to Farm Rep for Cloud Serpent Hunter Tame Book - Wowhead News
Mists of Pandaria Timewalking Guide - Wowhead
Mop timewalking event better have this as mount reward & Maybe challenge dungeons or something # OG art by -u/Blessybunny : r/wow