This video demonstrates how the Nikon D3200 works with the WU-1a wireless mobile adapter ($59). I am surprised that I could not find any demo videos in English, but you will get the idea. For now the WU-1a adapter will work only with the D3200 and only on Android devices, the iPhone app is coming later this year. At that point it is not clear if Nikon will add WU-1a support to existing DSLR models.
Here are the two main features of the WU-1a wireless mobile adapter as described on nikon.com:
1. Function for transferring data to smart devices (Android) over a wireless connection
Images captured by the D3200, or already saved to a memory card inserted in the D3200, can be transferred to a smart device over a wireless connection. Transferred images can be viewed in the smart device display, or uploaded to a blog or social networking site to share beautiful photographs with a broader audience.
2. Remote shooting from a smart device (Android)
The camera's live view display is shown in the smart device screen, enabling remote control over shooting. The live view display shown in the smart device screen always shows the current view through the lens mounted on the camera (live view display), allowing users to accurately frame and predict results with remote control over shooting. Basic information, including the camera's battery indicator, whether or not an AC adapter is connected, and number of exposures remaining, as well as shooting information such as shutter speed, aperture setting, and focus points is displayed in the smart device screen.