There seems to be a lot of conflicting information around what hardware is actually in place. It's my understanding that the Broadcom IC in the 2nd and 3rd generation touches supports WiFi, Bluetooth and FM radio and these are all seperate and independant features.
However, I remain unconvinced that the aerial required for FM broadcast receiption is available as there would most probably need to be an electrical coupling between an antenna terminal on the IC, and one of the terminals on the headphone jack. I had a look at some teardown photos last night and could not find any evidence that this coupling exists, although knowing Apple it's entirely possible that they fitted it just in case they decided to enable the feature. Someone on Engadget has also suggested to me that there would need to be at least a couple of capacitors on the PCB to allow the FM receiver to function.
The article in 9to5 Mac suggests that the FM receiver has been used to interface with the Nike+ kit, but that may not necessarily mean that the hardware is fully capable of receiving FM broadcast signals.