Η Microsoft states that it will suspend the release of optional preview updates of Windows 10 in December 2020 due to the "minimal operations" at its headquarters in Redmond.
The company has confirmed that it will only prioritize security updates in December 2020, as its developers will be absent for the holidays.
The optional preview updates, released on the third and fourth weekteam each month, they will stop, but security updates will continue as normal. These optional updates are also known as “C” and “D” releases.
"Due to the minimal operations during the holidays and the upcoming Western New Year, there will be no preview releases for the month of December 2020. The monthly service will continue with the security releases of January 2021", he says Microsoft.
Recent Windows 10 preview updates focus on bug fixes and enhancements before the next major feature update update is available. So it is rather unlikely that new features will be added to Insider builds by the second week of January 2021.