"Wibree is a new interoperable radio technology for small devices. It can be built into products such as watches, wireless keyboards, gaming and sports sensors, which can then connect to host devices such as mobile phones and personal computers. It is essential the missing link between small devices and mobile devices/personal computers."
Wibree is mainly designed for applications where ultra low power consumption, small size and low cost are the critical requirements. Wibree can be seen as Bluetooth enhancer in many ways rather than a bluetooth killer (Wibree is going to compliment bluetooth and not to replace it).
Currently Wibree is not yet used in any products.
In 2007, Wibree has been included in the Bluetooth specification, as the Bluetooth low energy technology. For more info on this, please see this link.