hi on Wed next week ( 04th Oct ) I will be turning on the altarch push for SIG's. This would be content that lands in the same place as the supporting distro ( so under /altarch and not /centos on the mirrors ).
Please sync with Brian, Fabian or Thomas to make sure your release tag's are in place, and they know about them so they can add it to the content control files.
note that you will also need new -release files that can be dropped into the Extras/ for the supporting distro tree's
regards