The Cortex-A75, A55, and Mali-G72 will succeed the A73, A53, and Mali-G71, respectively, when they launch sometime next year. ARM will reveal more about the SoCs and the accompanying features at Computex 2017.
https://www.notebookcheck.net/Leak-details-ARM-Cortex-A75-A55-and-Mali-G72-for-2018.224136.0.html