In a press release outlining devices that Samsung was honored for in the CES 2018 Innovation Awards, the company quietly dropped some news about the Exynos 9810, its next flagship chipset. From the Exynos 9 series, it's preceded by the 8895, which can be found in global variants of the Galaxy S8 and Note8.
Not much was said about the chipset, but it will include third-generation custom ARM cores, built on a second-generation 10nm process. The firm also said that the GPU has been upgraded, unsurprisingly, which likely means that it includes Mali-G72.
Another tidbit of information is that the LTE modem will include 6CA support, so it will offer speeds of up to 1.2Gbps, if your carrier supports it. The current flagship chipsets, such as Qualcomm's Snapdragon 835, include support for up to 1Gbps.
Typically, Samsung uses Qualcomm chipsets in the U.S. variants of its phones, while using its in-house Exynos SoCs in the global models. Last year's Exynos 8895 included support for recording video at 4K resolution and 120fps, but the firm couldn't offer that feature in its Galaxy Note8, being that the Snapdragon 835 only supports capture at 4K 30fps.
Presumably, Samsung has a more formal announcement planned for sometime between now and Mobile World Congress in February, where the firm will likely announce the Galaxy S9.