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I'm not sure, but it definitely seems as if they are making incremental upgrades and calling them new models. Two examples of this are the iPhone 4S and the new iPad. The crazy thing about this is that I know people who absolutely MUST buy the new one because, ipso facto, it is the new one. Apple is obviously doing very well at the moment, but as we have seen time and time again, it is very easy for a company to slip away from innovation into a state of stagnation. They have to figure out a way to keep making each new edition of their products more desirable than the last, and if they start releasing new models that are really only incremental upgrades on too quick of a basis, I think they will shoot themselves in the foot.