As mentioned in my previous post: https://www.microsoftcrmblog.com/2018/09/unified-interface-significantly-improved.html
Microsoft is pushing the unified interface to the production and in near future it will be the only UI which will be used.
You may have noticed that all individual users have now the possibility to update their settings. Microsoft replaced the UCI settings dialog with the traditional old UI setting dialog.
I am afraid, that in the end the new UCI interface will a be a mix of new and old interface and may be even of the old 2011 interface (which is still being used in some areas of Dynamics 365 such as goals).
What is your opinion about this direction? Are you happy with how the UCI is behaving?