There has been no official announcement yet, but CentOS 6.2 seems to have hit many of the mirrors already. http://www.centos.org/modules/tinycontent/index.php?id=30
See http://lists.centos.org/pipermail/centos-announce/2011-December/018335.html and http://wiki.centos.org/Manuals/ReleaseNotes/CentOS6.2 for more information.
