https://wccftech.com/samsung-might-be-working-on-a-5nm-exynos-chip-exclusive-to-china/

Samsung's mobile chipset division that is responsible for making Exynos chipset that we have grown accustomed to is going through a bit of upside-down experience in general. Everything ranging from a poor performance against the competition to changing the architecture altogether. Samsung has decided to move away from the custom cores that they develop in-house and have decided to opt for ARM cores.

The first chipset by Samsung that will be going through this change is going to be the Exynos 1080 as confirmed by the Samsung china R&D institute and according to the source, it is going to debut by next year but it will not be in a Samsung smartphone.