Revamped designs to the iPod Nano and the iPod Touch are the prevalent rumors being spread in the wake of Apple’s recent announcement to hold a special event September 9 in San Francisco. For the past four years, new digital music player introductions have been the practice of Apple prior to the holiday season. Also speculated is a decrease in price to the iPod Touch. One rumor is that the iPod Touch will have a curved outer shell, which is inferred from the recent upgrades to the iPhone 3G. Additionally, many expect the iPod Nano to receive substantial redesign. The 4th generation Nano may have a slimmer design, while not affecting the screen size of the current model.

The theme of the invitation is “Let’s Rock,” and the event will take place at the Yuerba Buena Center for the Arts Theatre in San Francisco, CA at 10:00 AM PST.

Last quarter, iPods represented 22 percent of Apple’s total revenue. As is the trend of past years, the Cupertino-based company expects to sell its most iPod units during the holiday season.