Another Apple blockbuster...

As Apple released its new generation of iPod's comprising of 6th generation Video iPod's, Nano, and iPhone inspired Touch Internet world is all buzz with there various features. However being a n iPod 5th generation user i was left with some questions...The redesigned split-screen user interface of the third-generation iPod nano, also available on the sixth-generation iPod classic enhances the visual and listening experience. Also attractive is the coverflow design. But can't Apple release a software update so that these things also work on earlier generations of iPod Video and Nano???
One may point that Apple may be attempting to boost its sales by making users shift from 5th generation to 6th and thats why it will not do so...but for me the company of the league of Apple will not do so. So i just want to know that is there a hardware shift from earlier generation of iPod's which prevents earlier ones from having a software update enabling such improvements.....I think this can provide some solace to 5th generation owners who yet can't afford to have another iPod...