A heretofore-unknown device called the Lenovo TB-X607Z has just appeared on Geekbench 4 with the Snapdragon 690 SoC and 4GB of RAM. According to a concurrent Google Play Console leak, it will be called the Tab M10 5G on launch. Therefore, this slate might be the first to bring next-gen connectivity to its line in 2021.
https://www.notebookcheck.net/The-Lenovo-Tab-M10-series-is-about-to-go-5G-in-2021.537889.0.html