Some changes in the naming of Office click to run updates (typically delivered from Office 365):
Based on customer feedback, we’ve changed how we refer to our update branches. The name changes are as follows:
Current Branch is now called Current Channel.
Current Branch for Business is now called Deferred Channel.
First Release for Current Branch is now called First Release for Current Channel.
First Release for Current Branch for Business is now called First Release for Deferred Channel.
Only the names are changing. The servicing model for each of these channels remains the same. We’re in the process of updating our content, so you’ll continue to see the previous naming during this transition.
and some references: