The update brings July security patch, new/or improved features and some Russian bloatware (Only Russia csc fw). Update size is 845,14MB. The bootloader is updated, from U4 to U5, and downgrade to a previous version isn't supported anymore. Now I'm downloading, will make a review for added features and improvements.
Edit after update: the only new feature I've noticed is full haptic feedback (while holding for 2 sec the power button, holding a page in home screen and holding a Quick Settings shortcut.
In the latest update of M51 it's written in the changelog that it's been added...so same should happen with A51 🤔 🤔