[derefr]

In most client apps that obey backend-account feature-flags, the app will introduce (advertise) the feature to you itself when your account gets the switch flipped.

AFAICT, they don't expect this announcement to reach or sway anyone who's going to use the feature; this post is more there to serve as genuine news—i.e. it's written to provoke water-cooler "what Google is up to" conversations among developers. (It's on the Google Research blog, after all; what consumer would even see it?)