There is no Gedcom 6.0 that I am aware of. Family Search (the organization that created GEDCOM) is testing a Gedcom X but no one else is using it as yet. This again was a solo effort by the LDS based Family Search with no input from any others. The current standard is 5.5 which is very old. FHISO is NOT using the old GEDCOM standard to create a new one. They have not yet begin creating the standard but it will be a "from scratch" effort by many companies / individuals when they do. At this time they are in the process of building the organization. If you really want to learn about FHISO I would suggest visiting their web page at
http://fhiso.org/Whereas the current GEDCOM was developed by Family Search and became the default many years ago. It has not been abandoned by anyone at this point. If you really want to learn about FHISO I would suggest visiting their web page at
http://fhiso.org/