Duo is replacing Hangouts in Google's batch of preinstalled apps

Allo may be the future of Google’s messaging efforts, but it’s Duo that will replace Hangouts as one of the preinstalled options on future Android phones.
An email about the change recently went out to partners that install Google Mobile Services on their phones. This is distinct from the Android Open Source Project, as enabling these services means agreeing to a license with Google that your phone will include this distinct bundle of apps. Basically, all devices with the Google Pla