Some interesting information about the non-plus successor to the Qualcomm Snapdragon 888 SoC has been offered up by a noted tech leaker. It appears the chip will be called the Snapdragon 898, and it will sport a prime core based on the ARM Cortex-X2 architecture that will be able to hit clock rates of above 3.0 GHz.
https://www.notebookcheck.net/Purported-Snapdragon-898-SoC-is-the-real-successor-to-the-Snapdragon-888-and-comes-with-a-faster-ARM-Cortex-X2-prime-core.552549.0.html