Life's not fair. Before you can even get your hands on an iPhone 4S, the people at FixIt have already torn one apart.
While the general public felt a bit let down there was no iPhone 5 released, the folks at FixIt were disappointed to see Apple once again used pentalobe screws instead of something more challenging. After disregarding the "Authorized Service Provider Only" tag, the disassemblers found the iPhone 4S has a superior battery, which most likely can't be transplanted into an iPhone 4. The final payoff? A gander at the phone's Apple A5 chip.
The latter is considered the Holy Grail of the endeavor since the 1 GHz dual-core processor with 512 MB of DDR2 RAM houses Siri, the 4S's defining feature. "If Siri has an address, this is it," according to the FixIt post. "Though iCloud integration can be used with any iOS 5 device, Siri only works with dual-core devices." FixIt then got die photo of the processor from Chipworks, which is displayed below.
You can see FixIt's thorough tear down here.
BONUS: iPhone 4S Product Details