The snow is a recent addition, I assume because of the winter event and probably also as a test for a weather/season system. They went a bit overboard with the snow... it would look better if the grass/vegetation was withered and yellow/brown in colour instead of just making the texture white.
The graphics aren't terrible but not great either, so expect no Skyrim/Witcher 3 or even Conan Exiles. But as it is still pre-alpha or early alpha stage, I expect many things to get an eventual overhaul.