I've been hearing the same thing on other forums during the past 24 hours. Yeah, major headaches!!! I'm going to try my best to keep them at iOS 6 for as long as I can. We've got most of our iPads as "unsupervised" so we aren't forced to update them. The ones we have as "supervised" I am worried about...
We had some students who updated our shared iPad cart iPads to iOS 7. It currently isn't working well with Apple Configurator for us. I used this article and the following website to download iOS 6.1.3 to restore these iPads to a functioning state. Our MDM is currently not updated to work with iOS 7 and I am having activation problems with Apple Configurator so it looks like we will be sticking with 6.1.3 until things get updated.
Configurator seems to force new and unsupervised iPads to download the latest update. If your iPads are already in Supervised mode, you can set them to not update.
We also went into our MDM and blocked the sites
to prevent the updates from being delivered.