Weibo and Twitter stalwart Ice Universe has heard from multiple sources that the upcoming Galaxy Z Fold 3 will use an unannounced chipset from Samsung. It could likely be the Exynos 2100 successor, tentatively called the Exynos 2200.
https://www.notebookcheck.net/Samsung-Galaxy-Z-Fold-3-to-use-a-Top-Secret-chipset-Ice-Universe.532848.0.html