The current version is 2.3. It was announced on January 29, 2004.
The filesystem standard has been designed to be used by Unix distribution developers, package developers, and system implementors. However, it is primarily intended to be a reference and is not a tutorial on how to manage a Unix filesystem or directory hierarchy.
The process is overseen by FHS editors, Rusty Russell, Daniel Quinlan, and Christopher Yeoh.
Any discrepancy found in the various formats of the specification will be resolved in favor of the PDF version.
FHS 2.2 release:
13 October 2003 - Maintained by freestandards.org