According to PR, Sigma currently is working on a new ultra-wide zoom lens for Canon and Nikon DSLR cameras.
There will be two new verison: Sigma Art and Contemporary, with a different price tag. Just like Sigma 150-600mm f/5-6.3 DG OS HSM Contemporary Lens and Sigma 150-600mm f/5-6.3 DG OS HSM Sports Lens.
The aperture of this lens is not yet leaked, stay tuned for more info.
Read More: Sigma Rumors