You could see some pretty definite hints here, now it's coming to life. So, what exactly is it?
Generic Schedule Updater
dz3-schedulermodule provides the interface, and
AbstractScheduleUpdaterprovides the most generic baseline for implementing any back end integration. Want to store your schedule in a flat file? Be my guest. Want to read it off IRC? Anytime.
The updater is injected into the scheduler, so you're pretty much free in what and how you do it. That is, in case if you're not happy with the concrete implementation that will be a part of the release.