there's no patch notes, because there is no patch yet. Therefore, it doesn't exist. Patch notes are not released until the day of the patch.

A patch preview exists, in the developer's blog. It touches on some of the things that are going to be in the patch.

The patch is still at least a month away... there aren't gonna be notes
Careful. No date has been given. Until a date has been given, speculating on a timeframe is unwise.