this is what rumours do.
remember the 3GS rumours?
"matt back, with a 5 mp camera + flash, LED screen, anti-glare available, 64GB HD, apple logo on back that lights up."
apple update, yes, but they dont necessarily produce at a particular time. and if they do then chances are it'll be something you dont expect.
i'm not saying yes or no, as apple are top secret so why would i know, but im just saying it's all rumours until they do release anything new.
this is apple, this is the ipod, there will be updates, its one of their little cash cows
i wouldnt call it a cash cow myself, but whatever.
yeah, this is apple, but that doesnt mean they've set september as a release date for anything.