Cool design: light but clear – Dribbble – Matt D. Smith.
Also a good solution for merging label and placeholder in an elegant way (FloatLabeledTextField).
A Beacon is a Bluetooth Low Energy device signaling it presence using iBeacon protocol. Each beacon contains some configuration data (unique id “which uniquely identifies a beacon or set of beacons as being of a certain type or from a certain organization” and major and minor identifier). These data can be used freely.
iOS7 can be declared as a Beacon and can monitor (detect there presence and measure there ditance) of other beacon, either iOS device or other devices.
This can be a “farther” competitor of NFC opening new type of interactions:
EDIT: An implementation for Android 4.3 is available here: https://github.com/RadiusNetworks/android-ibeacon-service.
For each type of widget, the equivalent in iOS 6/& & Android world: PortKit: UX Metaphor Equivalents for iOS & Android.