@droid - Yes! It’s already possible to add your devices to Google Home (via myopenhab). Read my how-to article/video here for information how to tag your items and link them in the Google Home app.
As far as the new view in the Google Home app, i’m not sure it fully allows control yet. In my app, Chromecast devices show up with a link below them (e.g. “Play song”), while openHAB items only show up with a configuration link (i.e. change the room assignment, label, etc.), with no possible actions yet…Hopefully that’s something Google will add in the future.