You can now preorder the new Yongnuo 50mm f/1.8 E-mount lens on Amazon and BHphoto.
Christopher Frost tested the lens and writes:
Here’s another low-budget option from Yongnuo – quite an interesting one, actually, as it promises to be a little sharper than previous models. It’s for Sony E-mount cameras only, and it only offers a cropped (APS-C) image. All pictures taken by me on Sony a7R II and a5100 cameras.