Improvements include a new full HD visible sensor and a new circuit board allowing 720p HD video of the central cropped full HD feed. This gives you the best of both worlds, the resolving power afforded by a high zoom (30x) full HD visible camera with the smaller file sizes of 720p (a 1/4 of Full HD file sizes).
A simpler and cleaner user interface has been implemented, while keeping the easy to handle and understand the physical interface and menu structure - putting powerful features at your finger tips, if you want to use them.