Gearbest has confirmed that Xiaomi will be shortly releasing a Mi TV Stick. Building on the Mi Box S, the Mi TV Stick will support 4K HDR, DTS-HD audio, 802.11 ac Wi-Fi and Bluetooth 4.2. The Xiaomi Mi TV Stick will come preloaded with the Android 9.0 version of Android TV, but it may cost upwards of US$100, making it considerably more expensive than the Mi Box S.
https://www.notebookcheck.net/Gearbest-confirms-Xiaomi-Mi-TV-Stick-with-4K-HDR-and-Android-TV-ahead-of-imminent-release.465626.0.html
I guess you have to step up all the way to the Shield non Pro to get Dolby/Atmos support, a common deficiency with these cheaper sticks apparently. Wound be nice if there was a cheaper alternative!
There is.Tivo streaming stick with atmos