You don't need a Google Home appliance to control a Chromecast with your voice: You can do so from your phone now as well.
Recent Chromecast Ultra Stories
I couldn't be less happy with our TV situation, which is the exact opposite of what I'm trying to achieve at the new house.
You can cast anything from Android, even from apps that don't natively support Google Cast or Chromecast.
Google is now offering a Preview Program for its Home and Chromecast devices, with access to new features before their broader release.
As expected, Google launched its new Pixel phones, Daydream VR, Chromecast Ultra, Google Wi-Fi, and Google Home products at a press conference today. But as noted previously, details about each had previously leaked.