Windows 10 Mobile cumulative update for Fast Ring.

What may be the most interesting thing about this new update is the reference, not to “Windows 10 Mobile,” but to what appears to be a new naming scheme:

April 2017 Update for Windows 10 Version 10.0.15063.138 for arm-based Phone Devices

Have we seen the last of “Windows 10 Mobile”? Is this the beginning of a shift to a new Windows 10 / Windows 10 on ARM paradigm?  What the heck?