Professional ($1,250): 4K Camera
Advanced ($1,000): 1080p Camera
Both feature new indoor positioning sensors, improved GPS and the new technology from the inspire controller and DJI Pilot app. The new controller and app is a huge improve and mirrors the technology used in the more expensive Inspire 1. My favorite features include the automatic take off/landing button and the ability to point the camera at a subject and have it follow it.
Here is a great article from Engadget: DJI's Phantom 3 brings 4K recording to its most popular drone