There is a channel provided by the upstream provider called FasTrack.
This channel will have RPMS that are going to be included in the normal
update sets (3-4 times per year), but released once a week. These RPMS
will normally be bugfix or enhancement updates and not Security updates.
Accordingly, CentOS has created a fasttrack (note the spelling difference,
it is intentional) repo. This repo will track the upstream FasTrack channel.
If you would like to use the FastTrack repo for CentOS-7, copy the file
CentOS-fasttrack.repo into your /etc/yum.repos.d/ directory and it will
be enabled.
See this upstream mailing list post for more info on fastrack:
https://www.redhat.com/archives/nahant-list/2006-April/msg00001.html
Also see the upstream info here:
http://www.redhat.com/rhn/rhndetails/fastrack/