Google has recently announced a new Chromecast device. However, the new device's interesting thing is not just the fact that it comes with Google's new "Google TV," but the fact that it will not support Google's game streaming service at launch. That's right. You will not be able to play games via Google Stadia until sometime in 2021 on the new device.
This is an interesting decision on Google's part. With the Stadia Premier Edition, including a Google Chromecast Ultra device in it, it would appear that any further iterations of the Chromecast would include support for Stadia, but this is not the case.
The new Chromecast will come with over 6500 applications that you can use. Stadia, although not officially supported, appears to be able to be sideloaded onto the new Chromecast, but this is not the ideal solution. This was confirmed by The Verge. They have also confirmed that you can sideload the Xbox Game Pass application to play xCloud on the new Chromecast. However, performance varies from person to person.
So, if you are looking to buy the new Chromecast to take advantage of your Google Stadia subscription and games, it may not be the right choice right now. The best bet would be to purchase a second hand Chromecast Ultra or shell out $99.99 for the Stadia Premier edition to get the Stadia Controller, and an included Chromecast Ultra.