The authors and editors overlap with the original specification's authors. It would appear that, if the PNG group is still publishing a standard, that this is a

The authors and editors overlap with the original specification's authors. It would appear that, if the PNG group is still publishing a standard, that this is at least the spiritual successor. Also, this is still a working draft, so it's unlikely libpng (a notoriously conservative, for good reasons, library) would implement the standard until it has been accepted and ratified. So that's not really an indicator of their support for it or not.