Same thing that they give on the D3200: the ability to make much bigger prints; the ability to crop more aggressively and maintain net image quality; much larger files that consume memory, storage and processor at a faster rate.
They're probably better pixels too, but probably not radically so. It's probably a very near sibling of the D3200 sensor, so the differences are likely not in the sensor but in the rest of the package.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!