It's already confirmed in the game that it's going to start on January 23rd, 2024.

Confirmed & Possible Changes Prediction in Diablo 4 Season 3
Confirmed:
-AoZ will be removed once the Season ends (might make it back into game later).
- Melted Heart of Selig PvM Nerfs.
- Perma Red Helltide (55m on / 5m off every hours).
- Gauntlet / Leaderboards.
- Rod confirmed that Nerfs coming to Ball Lightning Sorc & HotA Barb.
- Improvements for D4 Gold Trading for Console.
- More 925 Item Power source outside of Duriel.
Hopes:
- Fix Snapshots in particular Element, Accelerating Aspect swaps, multiple Key Passives on Sorc, etc.
- Hopefully a fix to lags/performance issues
- Maybe we could see some Powers like Metamorphosis be integrated into the game (similar to Varshan S1 Rings)
Diablo 4 Season 3 Abattoir of Zir Build Tier List - D4 S3 TOP 10 Builds
| Build | Season 3 Possible Changes Prediction? |
| S+ | HotA Barb | Fix the double Rune 1.3x Multiplier | Possible Overpower generic multiplier changes? |
| Ball Lightning Sorc | Change to Ball Lighting base dmg / Attack Speed scaling |
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| S | Shred Druid | Change to the double dip mechanic of Blurred Beast & Stormclaw |
| Bugged Combo Rogue Ranged RF / Pen Shot? | Fix to the Combo Point Tibaults Will +20 Resource giving 20 Combopoint with Condemnation Dagger |
| Bugged Combo Rogue Twisting Blades | Fix to the Combo Point Tibaults Will +20 Resource giving 20 Combopoint with Condemnation Dagger |
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| A | Infinimist | Buff to the Enitre Necromancer Class especially Pet Builds |
| Upheaval Barb | Seems fine mostly? Animation still a bit clunky |
| Death Blow Barb | Seems fine |
| Double Swing Barb | Seems fine |
| Arc Lash Sorc | Seems fine after Ball Lightning changes |
| .. more builds |
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| B | Blizzard Sorc | Seems fine? |
| Pulverize Druid | Needs a buff |
| Werenado/Petnado | Needs a buff |
| Stormclaw | Needs a buff |
| Bone Spear Necro | Nerfed to many times / Revert of the Ossified Essence Nerf |
| .. more builds |
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| Not a good idea to play these |
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| F | WW Barb | Make it work with Attack Speed & Overpower! |
| Thorns Barb | Scale with Overpower? |
| Leap Barb | Additional Ways to reduce Cooldown - add more ways to proc Earthquakes LEAPQUAKE! |
| Rend Barb | Fix Gushing Wounds to be an actual dmg multiplier |
| Frenzy Barb | Needs an AoE component similar to what they did in Diablo 3 |
| Pet Necromancer & Druid | PET BUILDS NEED A MASSIVE BUFF - Mendeln Necromancer was so fun in Season 1 but nerfed to the ground |