Dayong Li shared these first pictures shot with the new Laowa 4mm f/2.8 Micro Four Thirds lens.

Laowa writes about this 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.

The new 16mm Sigma lens is now shipping in EU and USA at Wex UK, Amazon Germany, BHphoto, Amazon and Adorama.

Imaging Resource tested the new Sigma lens and concludes:

The Sigma 16mm f/1.4 DC DN Contemporary lens is a solid choice for Sony E-mount and Micro Four Thirds shooters looking for a wide, fast prime lens that doesn’t break the bank. The optics are mostly impressive, capturing sharp, detailed images in nearly all situations. With some small nitpicks aside, including a poorly-designed lens hood and some issues with aberrations and flare, the lens is very good.
Taking into consideration its price point, build quality and the pros and cons of its overall performance, I think that the Sigma 16mm f/1.4 DC DN Contemporary is a good lens and could be a great choice depending on your particular needs.