A few months ag0 Microsoft announced that Windows 10 would receive major updates just twice a year, scheduled for September and March. Based on feedback from enterprise customers wanting a more tolerable schedule, Microsoft moved to make their release schedule more predictable.
What some people missed is that they also announced an identical schedule for corporate subscribers to Office 365. They aligned the update schedule with Windows 10. Microsoft says they plan to deliver and support Office 365 ProPlus updates, starting in September.
Microsoft also extended support 50% from 12 months per update to 18 months. The additional six months means your IT team can choose to push updates just once or twice a year.
The twice-a-year feature updates will be named Semi-annual Channel (Pilot) and Semi-annual Channel (Broad), each describing how Microsoft envisions them being deployed in the enterprise. Most people will probably just refer to them as simply “Pilot” and “Broad”.
You can get more information here.