We just released a blog post about changing the way we release OSTree
content to the public:
http://www.projectatomic.io/blog/2017/02/matching-fedora-ostree-released-...
Here is the TL;DR version:
The default Fedora cadence for updates in the RPM streams is once a day.
Until now, the OSTree-based updates cadence has matched this, but we’re
changing the default OSTree update stream to match the Fedora Atomic
Host image release cadence (once every two weeks).