MicrosoftThanks to the UserVoice entry as well: https://onenote.uservoice.com/forums/327186-onenote-for-windows/suggestions/32737648-include-onenote-for-desktop-in-office-2019
Here is the official announcement: https://techcommunity.microsoft.com/t5/Office-365-Blog/Your-OneNote/bc-p/982270
However, it does fall short of saying if it is OneNote 2019. It simply says that OneNote 2016 will be included in O365 Pro Plus and continue beyond 2020 aligning the mainstream and extended support of Office 2019 through to 2025. Also, apart from dark mode (and "at mentions"), it is unclear whether feature updates and development would continue as well.
This also appeared in the message center today with the message id: MC194800.
Configuration Change: OneNote 2016
MC194800, Plan For Change, Published date: 4 Nov 2019
We're continuing mainstream support for OneNote 2016 so that organization and individual use is uninterrupted.
Beginning March 10th, 2020, new installations of Office suite products will include OneNote 2016 by default.
In addition, config.office.com, SCCM, and Intune will display OneNote 2016 as being included with Office by default.
How does this affect me?
In 2018, we announced that Microsoft would end mainstream support for OneNote 2016 in October 2020. That is no longer the case.
Although OneNote 2016 is not available on the Office install pages today, it is coming back.
Admins can control whether OneNote 2016 is included in their deployments, regardless of what’s on the Office install pages.
What do I need to do to prepare for this change?
There is nothing you need to do to prepare for this change.
If your organization already deploys and uses OneNote 2016, no action is needed. Your users can continue to use OneNote 2016 without interruption.
Unmanaged installations of Office on or after March 10th, 2020 will include OneNote 2016.
If your managed deployments already exclude OneNote 2016, OneNote will continue to be excluded. You can configure your preferred OneNote 2016 installation behavior at https://config.office.com or using your existing software deployment solution.
