BMW is introducing the OS9 system to vehicles throughout 2023, and in its own press release it states that it will appear in the compact class first in the new BMW X1 beginning with November 2023 production.

It seems unlikely that it will introduce a new vehicle with the old operating system although it is possible, so if you are looking at getting one of the earliest cars it would be worth checking with the dealer to see if they can confirm the operating system that will be installed.

Based on the existing OS8 and OS8.5 versions, it is not possible to update the system software to the latter version as it also incorporates hardware changes, so we would not count on being able to upgrade OS8.5 to OS9.