Microsoft is in the final phase to prepare the customer driven update roll-out that will allow you to schedule the update of an instance to Dynamics 365 Customer Engagement, version 9.0. The window for processing the scheduled updates begins in February 2018 and ends in August 2018.

Dynamics 365 administrators will be notified via the Office 365 Message Center and will receive an email when the update scheduling window opens.

Who can update?

You can upgrade to version 9.0 from version Dynamics 2016 (8.0), Dynamics 2016 UPD1 (8.1) or Dynamics 365 (8.2).

How to update?

To see the update availability, navigate to the UPDATES tab on your Dynamics 365 Administration Center. Instances that are eligible for upgrade will have a Status of ‘Update available’. You can schedule your update and book your preferred and alternate dates.

More information:
https://docs.microsoft.com/en-us/dynamics365/customer-engagement/admin/manage-updates

 

Source:
https://community.dynamics.com/enterprise/b/365teamblog/archive/2017/12/18/customer-driven-upgrade-for-dynamics-365-version-9-0-is-coming