Small with good Video Camera
From what I have been reading in this foruns and reviews, the GH-3 is the most advanced/versatile small interchangeable lenses camera in the market. To find better (equal?) you have to go to top of range Canon FF cameras. The GH-3 is considered to be more advanced in its video capabilities than the (excellent) Olympus OM-D. Both are very good cameras, as are several others on the market.
The question is: how good in the video department does it need to be, for you?