Nobody but us geeks know those phones even exist or will soon exist. My parents and in-laws who are over 60 are aware of when new iPhones are on the horizon. The pending iPhone release has a much greater impact on the market. This is what comes from having only a handful of phones that run iOS -- people don't have to keep track of too much -- and the media helps (or hurts from Apple's perspective) since they actually report on pending iPhone updates in the main stream.
Android models are like the weather in the US midwest. If you don't like the current look of things then wait five minutes. The mere fact that you had to mention 4 models that people might be anticipating is proof of what I said. Android's largest buyer base are folks who walk into the store and want to upgrade and simply pick the best looking screen, the best camera or the most number of buttons they can find on a phone that still comes with a cheap or free upgrade. The public outside of us tech geeks is not clamoring for the next great Android phone -- there are simply too many of them for the layman to keep track of.
