SKUs for a revised iPhone 4, believed to be the iPhone 4S, and new iPod touch SKUs have surfaced in Apple’s inventory system, 9to5Mac reported on Wednesday. The iPhone 4 SKUs reinforce rumors that Apple will introduce a watered-down version of the device, perhaps with just 8GB of memory, as the budget-friendly “iPhone 4S.” The listings also lend credence to early analyst reports that suggested Apple will not make any hardware changes to the iPod touch. Apple may instead only introduce a white version of the popular media player. According to 9to5Mac, Apple lists a new “N90A” codename in its system, which likely represents a small upgrade from the original iPhone 4 (the N90). The two SKUs for the phone may represent white and black 8GB models. The iPhone 5 has not yet popped up in the inventory, it seems. Additionally, 9to5Mac reported Apple is now listing three new iPod touch models with the codename “N81A.” The SKUs are expected to represent white versions of the current 8GB, 32GB and 64GB models. Apple will unveil its latest iPhone devices, and likely the white iPod touch, during its press conference on October 4th. BGR will be reporting all of the Apple news as it breaks.