May be going for the geekiest Apple-related pressie lineup, but I got a Bluetooth 4 Low Energy (aka BLE) development kit from Texas.
Quite impressed seeing my iPhone 4S app talk to it. No special Apple accessory approval or jailbreaking needed to do that (over Bluetooth 4). It's a regular app using official existing APIs and can be put on the official app store . The range is excellent too, covers as much as my wifi network.
As this can be added to devices with a single chip costing about £2 in large quantities and essentially no setup is required (not even the old Bluetooth pairing) I reckon we'll see a lot of bluetooth-enabled things talking to apps in the coming year.
Might turn out somewhat of a little surprise from a often ignored new feature of the 4S.