Downloaded the GM earlier today and all my movies still said HD when viewing on my 2017 iMac. I checked again this evening and everything had update to 4K. YEAAAAAAAH! I heard a rumor that the 2017's weren't going to get this with Catalina, even though they were built with the capability to, so I'm pumped.
I would have been super bummed if I was a 2017 iMac Pro owner and they didn't turn on 4K.
In the past when viewing from non compatible devices like my iMac are really old 3rd gen Apple TV it would always say HD only.
3rd gen Apple TV still says HD only, but it never had the ability to be 4K so.....
Now I get this on my iMac
I would have been super bummed if I was a 2017 iMac Pro owner and they didn't turn on 4K.
In the past when viewing from non compatible devices like my iMac are really old 3rd gen Apple TV it would always say HD only.
3rd gen Apple TV still says HD only, but it never had the ability to be 4K so.....
Now I get this on my iMac