Recently, Amazon may have accidentally spoiled the launch of the NVIDIA SHIELD TV Pro, an upcoming update to the 2017 streaming machine. A new leak indicates that the OEM has indeed prepared a 4K HDR streaming stick as well as the usual full-scale box. It apparently has 8GB of RAM, whereas the SHIELD TV Pro has 16.
https://www.notebookcheck.net/The-NVIDIA-SHIELD-TV-Pro-is-likely-to-launch-alongside-its-new-4K-dongle-sibling.440281.0.html