@jobarjo Yes, there are implementations using mbed. If you go that route, you also get a nice BLE API to work with as well as all the standard mbed stuff. I haven't looked too closely at the Arduino board (Red Bear), but their source is on github so you can pull that and work with it without having the actual board.
https://hackaday.io/project/8512-nrf51822-development is my project for this chip. It includes a working project skeleton and instructions on setting up debugging. It uses a custom board that I made, but I suspect the one you linked to on ebay will work.