The smartphone industry is moving so fast, offering such a variety of models that if Apple releases an iPhone 5S in June, as is rumored, it appears destined to be a letdown. Apple typically makes changes in the form factor every two years, but often makes internal upgrades in between. A great article on 9To5Mac, titled, "Can Apple get away with another 'S' iPhone?" questions whether this sort of incremental upgrade this year will be enough to impress consumers.