Officially announced: New Sigma 16-28mm f/2.8 FE lens

Preorders:
In USA at BHphoto. Adorama. Amazon. FocusCamera.
In EU at Fotokoch DE. Erhardt DE. Calumet DE. WexUK.

Reviews:
Hands-on review at Explora. Review at PetaPixel. Review at CameraLabs.

Video reviews:

German:

Dutch: