When I initially wrote this post, I said it was possible that Tier 20 sets from Tomb of Sargeras would return in some form once patch 9.1.5 goes live and Legion Timewalking brings the 2016 expansion's content to Shadowlands.
Blizzard just announced a mixed bag of nerfs and buffs that will be arriving with the next maintenance on June 20 — so they'll be live just in time for the opening of Tomb of Sargeras.
Even though the Tomb of Sargeras and accompanying Tier 20 pieces don't release until next week, the first round of changes to the upcoming set bonuses went live with yesterday's patch (but didn't make it into the patch notes).
The PTR has been hopping with updates and getting tweaks here and there, but it seems the big changes are in and here to stay while the specific numbers may change slightly.
Ever since Patch 7.2.5 hit the PTR, Holy Paladins have been expressing serious concerns about our upcoming Tier 20 set bonuses, which required us to target injured, low-health friendly targets before casting Light of Dawn.
I love getting new tier sets.