Thanks! - The email I just received did not make that clear
Maintenance complete
We released a fix for the 2015 model Hubs that started experiencing Z-Wave communication issues as a result of the update. After monitoring the fix, we released that firmware version (25.27) to 2018 model Hubs. At this time, all 2015 and 2018 model Hubs have received a firmware update. Please contact us via support.smartthings.com if you have any questions.