For WM 2.0, there will be an expanded set of Natural Filter operators. I already mentioned the Coastal Erosion device. The Thermal erosion device is planned to be made newly useful, along with a few additional ones: Introducing the Snow device. I’ll let the pictures speak for themselves. 🙂
All of the above images use the Snow device to accumulate snow and ice on the heightfield; the snow mask is then used to assist in texturing them.