I thought a quick Office 365 ProPlus update might be worthwhile. Today sees the release of the new Deferred Channel version -1605 with new features and is the mainstream version as such. Version 1509 is no longer supported, while 1602 is supported until February 2017 with ongoing security updates.
A new First Release for Deferred Channel has correspondingly been released- 1609, which is available for advanced testing before it's released as the mainstream Deferred Channel scheduled for February 14, 2017.
Hopefully, I got all of that right! Your go-to places for keeping track of these versions and builds is here and here.