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Patches for Samsung Exynos machine code, DeviceTree sources and pinctrl drivers are managed in patchwork. You can always check there what is waiting for review or still being discussed.
Patches for Samsung Exynos clock, DRM and other drivers are managed by their respective maintainers by email.
Take a look at list of TODO tasks and Patches in progress. You may also check Community for resources and other work around Exynos Linux kernel.
krzk is running a board farm for boot tests (with few simple SoC/drivers tests) of current kernel. Donations of Samsung-based boards are always highly appreciated (see current list of boards and donators).