Latest watchOS beta warns users when opening watchOS 1 apps, says support will end soon

Apple Insider:

A message included in Apple’s first watchOS 4.3.1 beta warns users that older apps will no longer be supported in “future versions” of the operating system, suggesting support for software built with the watchOS 1.0 SDK could be deprecated with watchOS 5.

This is about watchOS apps built using outdated parts of the SDK. Another side of this: Will watchOS 5 continue to support the original Apple Watch hardware?