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The folks over at iFixit recently purchased a new second-generation iPod Touch and then proceeded to eviscerate it. 

One notable finding during this process was a Bluetooth chip, this chip is probably intended to be used exclusively in connection with Nike+.

In addition to the Bluetooth chip, the headphone jack now has five pins as opposed to the previous four. It is suspected that the fifth pin will give the iPod Touch external microphone support, as you may be aware, Apple’s new in-ear headphones have a built in mic. 

Apart from these two minor changes, it seems as if little has changed in terms of the iPod Touch’s insides.

See the iPod Touch disassembly here

Update: Apple has announced that the Bluetooth chip is not compatible with Nike+, this makes you wonder, “what on earth is it for then?”

[MacRumors] [iFixit] Image link