The Nikon D3200 will not have Wi-Fi capabilities built in the camera. This functionality will be provided with an optional wireless adapter (sold separately of course, similar to the WT-5). Upon attaching the Wi-Fi adapter to the camera, you will be able to upload images to social networks or email them. The new Wi-Fi functionality will also allow you to control your D3200 camera remotely from your smart phone (just like the D4).
Nikon is expected to introduce similar technology in their Coolpix line refresh in August, 2012.