Venus Optics announced the development of the new Laowa 4mm f/2.8 Fisheye MFT lens:

Featuring a 210° angle of view, this lens delivers unique circular fisheye field of view on Micro four thirds cameras. The ultra-wide angle view allows photographers to create 360° panorama with ease. Despite the unique & ultra-wide perspective, the lens only weighs 0.3 pounds (135g).

Specifications can be found in separate email attachment.

Exact shipping date (mis-late 2018) and pricing are to be confirmed.