We had an idea it was coming soon when it prematurely was visible on the Chromecast support page last week. This morning, HBO GO was updated in the Play Store bringing Chromecast support. If you already have a Chromecast and an HBO subscription, just grab the HBO GO app from the Play Store by using one of the links below. If you already have HBO GO installed, then all you have to do is download the update, and you will be good to go. Download links after the break.