Two months ago I reported about a new Samsung 10mm f/3.5 lens which was officially announced today - it is the slimmest and smallest fisheye AF lens on the market:
"At 72g, this compact lens comes in stylish white or black to complement the NX series of cameras, and easily fits into a camera bag or purse for lightweight travel and outdoor shooting.
The 10mm F3.5 Fisheye is also fitted with a Circular Aperture Diaphragm to bring the subject of your images front and center."
Some sample images taken with the new lens can be found here.
Lens specifications: