Recently Daniel Phillips announced that he is developing a new file system, Tux3. It plans to be a modern file system on level with ZFS and the currently also still in development Btrfs.

While there are many file systems like ext3, Xfs, Jfs and others are available for Linux it currently lacks a modern, new age file system: especially features like versions and writable snapshots are hardly available. On the other hand, other Unixes do have such file systems: OpenSolaris and some BSDs have ZFS, and DragonFly BSD has HAMMER.

More Here