As of July 2015, the VCFtools project has been moved to github! Please visit the new website here: vcftools.github.io/specs.html

VCF (Variant Call Format) specifications

The newer versions of the VCF v4.1, VCF v4.2, and BCF v2.1 specification documents can be found on github. The older versions of the documents are hosted on the 1000 genomes wiki page.

VCF format v4.0: 1000 genomes wiki
VCF format v4.1: 1000 genomes wiki | github
VCF format v4.2: 1000 genomes wiki | github
BCF format v2.1: 1000 genomes wiki | github

VCFtools-spec is a low traffic mailing list intended for VCF format related discussions, such as clarifications of the current format version or proposals of changes to the specification.