Wait, is the patch definitely going out today? In past PfH they announce the patch, and then it takes up to a week (or two) for the actual patch to release. Did they announce otherwise this time?
No? Patch gets always release during the PfH. Week before they used to post steam warning about save compatibility. I don't think we got it this time (am not on steam) but we did get early blog update in November.
unless you are on Mac, then the patch generally gets released a bit later. This was already mentioned in the pre-patch release post.
"Patch 9 will be live for Mac OS a bit later, as our teams are working on some final troubleshooting."