Apple has released a revised version of macOS 11.0.1 Big Sur, although it’s not clear why. That said, it can be downloaded by opening up System Preferences and choosing the Software Update option.
MacRumors says that it appears to be available for some Mac users who haven’t previously installed the macOS 11.0.1 update. In other words, if you’ve already installed macOS 11.0.1, you can’t install the “new” macOS 11.0.1.
AppleInsider has confirmed its availability in Apple’s developer portal, under the mainline release section. The article says this macOS 11.0.1 may be targeted t the new M1 Macs. 9to5Mac says the new build of 11.0.1 likely contains bug fixes and performance improvements for “select users.”