There is no to confirm this but when I ask the new Stadia Chromecast Ultra to play 8K videos from a Google Assisstant they look like they are actually playing in 8K. Is the new Chromecast Ultra already 8K enabled? Too bad there isn't a way to verify the resolution of videos playing on chromecast.
Edited to add: I'm using the latest 8k tv from Samsung.
@Odin1 Unless it's a new model (which I don't think it is), it plays up to 4K Ultra HD:
https://store.google.com/gb/product/chromecast_ultra_specs
@Odin1 Unless it's a new model (which I don't think it is), it plays up to 4K Ultra HD:
https://store.google.com/gb/product/chromecast_ultra_specs