Here's what the Director of Publishing at Larian Studios had to say about this on Twitter yesterday:
"The Xbox retail version, which plays across 3 discs, will ship with Patch 5 on disc. Which is really good news. These things have lead times, as you know. Working on the exact version for PlayStation 5."
In terms of what Patch 5 actually includes, we're still in the dark about most of it - aside from a few fixes to deal with things like slowdowns. If you're interested in finding out more, Larian will be sharing a "community update" very soon:
It's worth keeping in mind that the physical Deluxe Edition won't be shipping until early 2024, whereas we're hoping we'll get a December 2023 release date for the digital version by the end of next week. Patch 5 will obviously be included for digital purchasers as well, and we're assuming it'll be available around day one of the Xbox release.
We're getting closer and closer now... The Game Awards will hopefully answer any remaining questions!