I'm curious if anyone has explored Chromecast integration for voice output. I could imagine powering a separate A/V receiver for speaker output to each room for informative announcements (virtual doorbell, door/window open, door not locked, emergencies from connected smoke detectors, etc.) and using Chromecast for wireless audio distribution. Or should this be approached from the opposite direction - support for some audio app which has Chromecast support?
Of course the next challenge is intelligently determining when and where to send various announcement types. You may not want laundry announcements going to the kids rooms after bedtime, for example, but you would want them to broadcast to the living room and master bedroom.