The Samsung Galaxy M20 will have the new One UI, even though it will run Android 8.1 Oreo at launch. The Pie update is months away, it will be released in August.
Samsung published a notice with the Pie update schedule and it included the still-unofficial Galaxy M10 and M20.
The M10 will be powered by an Exynos 7872 chipset with 2/3GB of RAM. The M20 comes with an Exynos 7885 with 3/4GB of RAM and 32/64GB storage. In India, they will be available exclusively online through Amazon and samsung at prices of INR 10,000 and INR 15,000.