According to The Next Web and the “sources familiar with the situation”, the iPhone 4S, about to be unveiled at Apple’s Cupertino campus around 10am PT, 1pm ET, will sport “more definitive GPS features”, as well as the ones already rumored, such as an eight-megapixel camera on the back with a backlit sensor, a much faster dual-core A5 processor with 1GB RAM (twice the iPhone 4) and the pocket personal assistant simply named Assistant:

Our sources tell us the iPhone 4S “is much more powerful than an iPhone 4″ and “feels like the high-end device”, all but confirming that the device will feature Apple’s new A5 processor and include 1GB RAM, as tipped in previous reports, noting that the device will retain the same dimensions and design as the iPhone 4.

The GPS feature could be a Mapping thing – perhaps turn by turn directions or it could be Find My Friends, which we’ve detailed before. As for the back camera (which 9to5Mac discovered was sourced from Sony), the publication’s sources mentioned a 3264-by-2448 pixel resolution, the same as the now famous Sushi shot which made rounds in early September. The iPhone 5 with its teardrop design? Author Matt Brian explains it’s a prototype for a future iPhone 5 “which won’t be available any time soon”, which is in line with 9to5Mac’s findings pointing to the iPhone 4S with a design akin to the existing iPhone 4.

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