Apple's new fourth-generation iPad is already back in stock on the Apple website and this means one of two things. Either Apple produced massive quantities of the device ahead of launch or the fourth-generation iPad isn't selling very well. I'd like to think its the former, but I am forced to lean towards the latter.
The simple fact is that Apple always has supply issues for several weeks after launch and the lack of these shortages for the new iPad don't bode well. Apple announced that over the launch weekend 3 million iPads were sold, but they didn't specify which quantities of those were iPad minis and which were the new iPad fourth generation.
The iPad mini is still in short supply, with the web store offering up that it will be available to ship in roughly two weeks. Apple will have trouble, it seems, catching up with demand for the holiday season. It's not clear why the fourth generation iPad seems to be selling so poorly, but if you're looking to pick one up, it's probably a good thing.