https://www.minecraft.net/en-us/article/minecraft-1-19-3-pre-release-1
“We’re now releasing the first pre-release for Minecraft 1.19.3. This pre-release fixes a few bugs contains a few tweaks and has some technical changes.
If everything goes as expected, we aim to release this version on December 6th.
Happy mining!” By Mojang.
with that being said we will start working on getting ready for this update on December 6th or later if Mojang pushes this date back!