The version information in /usr/src/sys/conf/newvers.sh was just changed to read 10.0-RELEASE in the releng/10.0 branch.
http://svnweb.freebsd.org/base?view=revision&sortby=rev&sortdir=down&revision=260664
http://svnweb.freebsd.org/base?view=revision&sortby=rev&sortdir=down&revision=260664