No email arrived, but hub updated to 18.21 in NJ, USA around 10:53AM EDT on Aug 10, 2017.
So far I noticed on the Android app “My Home” things listing when clicking the Cree Bulb and Samsung power switch (updated today), the status no longer instantly updates. They stick at “Turning On/Off”, but the bulb/switch actually turns on or off. In 17.14 it would generally quickly follow through to Off or On. Reloading the “My Home” shows the correct status. The device’s stand alone page also gets stuck at turning on/off.