You may have heard of the BTRFS file system. BTRFS is an advanced, next-generation file system which was jointly developed by Oracle, RedHat and other companies.
When I came across BTRFS the first time, I dismissed it as yet another file system like EXT4 and NTFS. There are so many file systems available these days that most people don't care about what they are using. And there really is nothing to care about. The difference between file system formats like EXT3 and EXT4 are of interest only to advanced users. Sure, EXT4 provides journaling and better reliability than EXT3, but for the average user, there is nothing about EXT4 that changes the way they interact with their system on a daily basis.
BTRFS is different. It's such a big improvement over previous generation file systems that it will change the way you use your hard disks.