Samsung appears to be ramping up its plans for the Exynos chipset.
The deca-core processor could have some noticeable improvements over the octa-core processor. We can speculate that an increase in cores means the multitasking and gaming departments should see improvements while also possibly maintaining battery efficiency over the octa-core chip.
As said, these are just speculations at the moment and the actual improvements and upgrades can only be confirmed once the chipsets are made official and after testing.
Besides the Exynos 2400, we are beginning to hear rumours about the Exynos 2500, courtesy of tipster @OreXda. Similar to the Exynos 2400, the Exynos 2500 will be a deca-core chip but will include three performance cores and two slower performance cores in comparison to two performance cores and three cores on the Exynos 2400.
The rumoured specs for the Exynos 2500 could include one Cortex-X5 prime CPU cores, three Cortex-A730 performance cores, two Cortex-A730 performance cores clocked at a slower speed, and four Cortex-A520 efficiency cores. The initial rumours of the Exynos 2500 included four prime cores but Samsung probably didn't like the idea of using four prime cores owing to the possible heating issues afflicting MediaTek Dimensity 9300, which doesn't have any efficiency cores.
The Exynos 2500 is rumoured to be manufactured using a Samsung 3nm 3GAP process node. This SoC could be on the Galaxy S25 and Galaxy S25+ in 2025.