Apple
Customers who order the new MacBook Pro or iMac with the M3 series processor will have to update their macOS Sonoma as soon as they receive their devices on November 7.
Apple devices often require day one updates to fix bugs and enhance performance. However, unlike the iPhone, which Apple is trying to update remotely while still in the box, the Mac does not have such a system.
According to @aaronp613, a code sleuth on X, the new Macs will ship with an older version of macOS Sonoma that needs to be updated to a newer one. The shipped build number is 23B2073, and the new build is 23B2077. The current shipping build of macOS Sonoma 14.1 is 23B74.
The company hasn't shared release notes for the new build, but it likely contains bug fixes and performance improvements related to the M3 chips.