The Exynos M1 rumors heated up late last year with talk of the "Mongoose" from Samsung delivering significantly better performance than earlier Exynos SoCs. The M1 Mongoose is an ARMv8-A part with clock speeds around 2.3GHz. Mongoose is a brand new architecture for Samsung and delivering incredible performance based upon some leaked Android benchmark figures.
The Exynos 8890 is the first using the new Exynos M1 core. The first device using the Exynos 8890 is said to be the Samsung Galaxy S7, which reportedly will launch next month.
Anyhow, as of this morning in the latest LLVM code is now core tuning support for the Exynos M1, courtesy of Samsung.
Hopefully we'll end up seeing a (non-Android) Linux-friendly development board with Exynos M1 cores this year as it would be a delight to see how the performance stacks up for our favorite workloads.