All the available tier set bonuses for 10.1 have been revealed here:
Blizzard Revealed Every Tier Set Bonus in Patch 10.1 - Wowhead News
Here I show some examples from the new tier set bonuses:
Death Knight
Blood
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(2) Set Bonus: Heart Strike and Blood Boil deal 20% increased damage and have a 10% chance to grant Vampiric Blood for 5 seconds.
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(4) Set Bonus: When you would gain Vampiric Blood you are infused with Vampiric Strength, granting you 10% Strength for 5 seconds. Your Heart Strike and Blood Boil extend the duration of Vampiric Strength by 0.5 seconds.
Fury
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(2) Set Bonus: Rampage damage and chance to critically strike increased by 10%.
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(4) Set Bonus: Rampage critical strikes against your primary target cause your next Bloodthirst to deal 50% increased damage and generate 2 additional Rage, stacking up to 4 times. It also has a 100% chance to critically strike.
Protection
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(2) Set Bonus: Shield Slam deals 15% increased damage and reduces the cooldown of Last Stand by 0.5 seconds. During Last Stand these effects are doubled.
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(4) Set Bonus: For 10 seconds after Last Stand ends, Shield Slam unleashes a wave of force dealing damage to enemies in front of you and reduces damage they deal to you by 5% for 5 seconds.
The take from Zhujiang
I will try to keep it brief: I´m so so tired. STOP MAKING THE GAME FOR CLASS DISCORD MODS AND RWF PLAYERS.
Classes are already needlessly complex and makes the game almost impossible for new players to get into. Even some WoW veterans just wanna quit when they realize they have to create WAs just to play their class somewhat optimally. The talents in DF added massive ability bloat, which this game suffers from. The last thing we need is added complexity to this game from these tier set bonuses.
My Earlier prediction
In the above thread I literally predicted how the bloat from talents and lack of passive dmg from stuff like corruptions / azerite armor would make the raids harder and the clear rates for this Heroic Raid tells us everything. As always, when the game gets harder people leave (See Cata and Shadowlands). This is bad.
The raid participation numbers are ATROCIOUS. Blizzard clearly realised this as well, given the fact the borrowed power they added in .7 is basically passive dmg / healing designed to push guilds over the edge of whatever content they are hopelessly stuck on.
With the added bloat and complexity from the tier sets. We will see the M+ and raid skillgap even further. This is of course exacerbated by the tuning on everything being so tight (because the game is designed with the top 1 % in mind). It is also made worse by the fact that Blizzard for some insane reason, designs everything with actually HAVING tier sets, like we saw in Sepulcher. Instead of having tier sets being something that could be used to outgear content.
I am so so tired. Don´t get me wrong, will this change alone spell the doom for WoW? No, but WoW is dying a death by a 1000 cuts from a dagger wielded by an annoying theorycrafting Class Discord mod and it sucks.