A few sites have been reporting that Samsung's new Exynos 992 chipset that could feature in the Galaxy Note 20 line will incorporate ARM's new Cortex-A78 cores and in-house custom team Cortex-X1 cores. However, given both the minor name change and the Samsung's previous mid-year chip upgrade track record, it is likely to be nothing more than a die-shrink of the existing Exynos 990.
https://www.notebookcheck.net/Why-the-Exynos-992-is-unlikely-to-get-ARM-s-new-Cortex-A78-or-Cortex-X1-cores.467196.0.html