I figured they were done manufacturing, and were selling old stock at this point. We ordered 30 iPad 2s for the purpose of doing classroom surveys, and they all came with iOS 6 installed, so they were likely produced mid-last year, at the latest.
I laughed to myself as I used Configurator to bump them all en-masse up to 7.0.4, thinking about all the people who accidentally upgraded and whined about losing iOS 6. Bwa ha ha ha.
iPad 2s are great for this purpose; they're less expensive, sufficiently fast to do the job and less attractive a theft target than iPad Airs or Minis would be.
EDIT: I should add that if you have to configure a bunch of iPads and haven't played with Configurator, to do so. It's one of the coolest apps I didn't know existed! We bought an ergotron cart with built-in USB hubs that lets you plug up to 32 iPads into one Mac. They all show up in Configurator, and you can mass-wipe, install profiles and restrictions, and mass-restore a backup to all of them to make them identical. Really neat stuff, with absolutely NO similar software available for Android, which is why we went with iOS for this purpose.
Configurator looked really useful, actually. I had downloaded it at one point for something unrelated (pretending I know how side loading works, looking at logs, something like that) and the app itself looked really promising. Unfortunately I haven't yet acquired a fleet of iDevices to play with it, yet.