Powder Snow is an upcoming item that will be introduced in the Minecraft Caves and Cliffs update. This special block has tons of potential for both Singleplayer and PVP uses.
Powder Snow is mainly used as a trap item in which entities move slowly. These entities eventually become frozen as they take damage over time.
In these biomes, Powder Snow spawns commonly on and around the peaks of the mountains.
Powder Snow will also spawn in a Cauldron while it is snowing in a snowy biome. This snow can then be picked up with a Bucket, creating a Powder Snow Bucket.