mirrormanager still returns URLs containing {{{.../development/17/...}}} for released F-17 on secondary arches, I've checked also ppc/ppc64/arm after seeing this URL for s390x, some of the arches made the GA release a week or two ago
{{{ [dan@eagle ~]$ curl 'https://mirrors.fedoraproject.org/metalink?repo=fedora-17&arch=ppc64'
1339589981 4309 33ade2822163f4534a88ae236a2e29e7 6711533660e9af4bb61e3400c5ea4250a93aed80 2e3c7c94c50bfa8ddf590850e796c1d04a5727adfcfd520cce809a9bc35c7cf8 1648f5c30cf644b4cd8dbf8d585b0c2aef1c9857eabf9e86e04a97061fe2616282d7181e9c3b8fb8e65915d02d2031b82e75f93af6e0d3c00c0e87140c1da1c3 http://ftp-stud.hs-esslingen.de/pub/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml ftp://ftp-stud.hs-esslingen.de/pub/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml http://fedora-mirror02.rbc.ru/pub/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml ftp://fedora-mirror02.rbc.ru/pub/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml rsync://fedora-mirror02.rbc.ru/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml http://ftp.heanet.ie/mirrors/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml ftp://ftp.heanet.ie/mirrors/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml rsync://ftp.heanet.ie/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml http://archive.eu.kernel.org/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml rsync://archive.eu.kernel.org/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml ftp://archive.eu.kernel.org/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml http://ftp.df.lth.se/pub/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml ftp://ftp.df.lth.se/pub/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml rsync://ftp.df.lth.se/pub/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml http://archive.nl.eu.kernel.org/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml ftp://archive.nl.eu.kernel.org/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml rsync://archive.nl.eu.kernel.org/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml http://fr2.rpmfind.net/linux/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml ftp://fr2.rpmfind.net/linux/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml rsync://fr2.rpmfind.net/linux/fedora-secondary/development/17/ppc64/os/repodata/repomd.xml [dan@eagle ~]$ }}}
We have not yet flipped the switch over. Since development/17 and 17/Everything are the same its not critical that it is done right at release