Hey,
from what i have read in the past updates with the notification has been often a little bit delayed by the ownCloud people so that only the more experienced users are updating their installation and if any additional unforeseen issue occurs it’s not the less experiences users which are updating and get stuck with such problems.
But maybe it was also just forgotten to publish the updater config. I think for now all we as users an do is to either wait for an official statement from some one of ownCloud or for the update of that config later.