Photographyblog published pictures of a new Samyang 10mm f/3.5 full frame DSLR lens that will be available for both Nikon and Canon DSLR mounts - this is the world's widest full-frame lens and it is expected to be released in 2019. The Samyang 10mm f/3.5 lens has a zero distortion recti-linear design and glass mold aspherical lens elements.
Additional pictures:
Via NikonRumors