Patch 10.1.5 PTR - Build 49516 New Items
Tons of new items have been added in the first PTR build of Patch 10.1.5. Highlights include a new Naaru Hearthstone toy, new mount rewards from Time Rifts, a bunch of Naxxramas related items, as well as the Corrupted Ashbringer quest item: "The Ashbringer has lived in both infamy and reverence. In the timeline this came from, it was never cleansed. It would be unwise to touch it directly."
While it is very unlikely for the Corrupted Ashbringer to make a return, the quest item could be associated or lead up to unlocking the new rewards from Naxxramas in Patch 10.1.5.
Returning Patterns and Plans
Completing the achievement Wards of the Dread Citadel will unlock ancient secrets (profession patterns, plans and more) within Naxxramas.