If you look at the back of the iPhones, the iPhone 3GS was the last one to name itself. Recently an Apple store employee wasn't to happy that I kept saying iPad 4.
I suppose in a world where change is frequent and incremental rather than dramatic and rare removing the version number is appropriate to minimize consumer confusion.
What strikes me more about this iPad Air is the price points. $499 16GB wifi only is a very hard sell to the mass market when a Nexus 7 16GB comes in at $230. Size matters here, but I can see Apple being in big trouble when Google's tablet is half the price and has a handful of more advanced features. I guess that is why Apple hired that Burberry executive last week. They can sit right next to the Vertu store.