Yongnuo recently unveiled a mysterious new lens, reportedly equipped with its newly developed VCM motor (pictured above). The new lens will be an ultra-wide-angle (I’m guessing 18mm). An E-mount version will be available first, with the Z-mount version following later. In the images shown, the new lens appears roughly the same size as their 50mm lens and is said to have a 58mm filter thread.
Here is a demo of the AF capabilities of the new VCM motor:
Yongnuo lenses are sold at B&H and Amazon.