Next version of Earpods to include heart rate monitor, blood pressure, and ibeacon sensor.
Will ship with iOS8, & is meant to be a gateway into wearables.
Apple's new EarPods will have sensors in them, for heart rate & blood pressure. Also iBeacons so they don't get lost. They will require the lightning port, it's why the audio jack was moved to the bottom.
It stores the data in a similar way to thumbprint point data, fully encrypted and nothing identifiable. But nice to send to your doctor to keep track of at which point your blood pressure started rising for example.