Hello, just noticed new update, few moments ago. Do we have patch notes?
Thanks.

Ok, nvm found out on steamdb

Enabled Steam Workshop.
Manage your mods with ease on Steam! We’ve integrated the Steam Workshop support into The Witcher 3: Wild Hunt. While Steam users can still use Nexus Mods or whatever modding platform they like, they now can install any mod available on the game's Steam Workshop with a single click. Just find the mod you like, click “Subscribe” and it will install automatically!

Added Steam Workshop support for DLC mods (mods that include completely new content).

Added support for an easier way to add new world IDs in mods.

Added full support for loading DLC mods - fixed an issue that occurred when loading additional content from mods.

I wonder why this patch requires 52 GB of space

mine required 3.02gb. Or do you mean after install? I forget how large it was after install before.

52.3 is entire game.
Patch was doing update to bundle files and they are massive. Since patch cant just inject data into bundles its replacing them with new ones. Hence the size