ChunkPS (Tentitive Title) is a cloud-based NBT Chunk provider. It's currently being drafted, so things are likely going to change drastically.
ChunkPS is going to be craftd's main Chunk provider interface. But this doesn't mean that other servers, like Chunky Monkey, Glowstone, ect al won't be able to use it. On the contrary, ChunkPS will be designed for anything that deals with the Beta/Release NBT world format.