I updated my iPad 2 to iOS 9.3 over the air tonight and got stuck at the activation screen like a lot of others. I was forced to do an iTunes recovery restore. When I did, iTunes downloaded iOS 9.2.1 and installed that rather than 9.3. After everything was up and running again, I had iTunes check for updates and it said there were none and that iOS 9.2.1 is the lastest. It looks like Apple pulled the iOS 9.3 for iPad 2, at least through iTunes (since I just did the OTA update). I expect we'll see a 9.3.1 very soon.