Microsoft
For some reason my original reply disappeared so I had to re-write
This is how I’ve configured Office365 CDN with the aim of achieving phased schedules..
I’m using a “halfway house” mixing modern management and traditional IT to delivery this. CDN for the modern element and GPO for the traditional. Eventually I want to use pure Azure groups etc. to deliver the content but that will have to wait a little longer.
Below you can see a diagram of the solution.
1) Laptop is added to the O365UpdatePilotRing AD Group
2/3) The Office365Updates-Global GPO is applied to the laptop and the Pilot Ring configuration (including scheduling) is applied to the system through ILT on the GPO Registry Preferences (ILT filtered to the O365UpdatePilotRing AD Group)
4) Laptop initiates the updates process through the Office Automatic Updates 2.0 scheduled task.
5) Updates are downloaded and installed per configuration applied through the GPO (including scheduling)
6) Laptop runs a custom script to determine if office updates have been installed within the previous 24 hours, if they have then a SCCM hardware inventory scan is triggered to update V_GS_InstalledSoftware within the SCCM DB
7) Power-BI dashboard synchronizes through the on-premise gateway and reporting is updated dynamically and quickly to provide near real-time insights
I use preference order processing to ensure the ring configuration is applied correctly, below you can see the registry configuration per registry preference group (some custom Office365UpdateRing keys are included to provide granular reporting):
On the guidance received through premier support and the product group I now include the updatetargetversion key in an attempt to bypass the throttling and achieve the phased deployments: Initial, Pilot, & live.
I'm still in the early phase of testing Windows Update For Business and I should know more shortly 
I hope this helps.
