Apple is very successful at what they do. They are able to single-handedly convince people to hand over large amounts of money for iPhones and iPads. The company thinks that this tactic also works for their other products like the iPod line. It used to work, but I don't see much point in trying to sell people what is essentially an iPhone without the phone.
Apple sees a point, however, with rumors from 9to5Mac pointing to a new iPod Touch to be released alongside the new iPhone this September. Continuing in the fine tradition of nerfing the iPod Touch to be one generation behind the current iPhone, the new iPod Touch will be more like a iPhone 4S.
The rumors point to the new iPod Touch at least having one thing that its newer contemporary has - a larger screen. Leaked front frame images show that that iPod Touch will get a slightly larger four-inch display. That's where the similarities end, however, as the new iPod Touch is reportedly getting the current gen A5 chip and an iPad inspired shell.
It still remains to be seen if the new iPod Touch will be running on iOS6. The iOS5 for iPod Touch page features a teaser for iOS6 near the bottom, so it seems likely.
It's a little disappointing to see the iPod Touch get increasingly ignored over the last few years. It would be nice if Apple would bring it up to par with the curent iPhone builds. Some of us just want an iPod Touch and it would be nice if we could be on equal footing with our iPhone toting brethren.