Besides Qualcomm and its Snapdragon 845 expected to hit the market in 2018, being placed in the majority of High-End smartphones, Samsung also have prepared its known Exynos chipset for the next year.
Although the South Korean manufacture have not specified the name of the newest Exynos (2018) chipset, it publicly announced the date when the new SoC will be announced. There is a chance of this being in fact the Exynos 9810, which is about come underhood of Galaxy S9.
It’s unlikely to see this new chipset packed in any other handset other than Galaxy S9 lineup and possibly the Note 9 lineup. A few years ago some other companies like Meizu adopted the Samsung in-house made flagship SoCs, so only the future will tell if another brand other than Samsung will adopt the newest chipset.