The defining feature of the iPhone 5s is the Touch ID fingerprint sensor. The sensor is built into the home button and lets iPhone 5s owners unlock their device and authorize iTunes purchases using their fingerprint. The technology works fairly well and is a cinch to set up. Many believe the larger iPad will gain the same Touch ID sensor, but there's no indication that the iPad Mini will also get the feature. The module itself is estimated to cost Apple only $7, but Apple might want to give the iPad some features that the iPad Mini doesn't have.