It appears Sigma is set to announce four new Global Vision lenses at the upcoming CP+ Camera & Photo Imaging Show 2017 (Feb 23-26). Two of those lenses – the 135mm f/1.8 DG HSM Art and 100-400mm f/5-6.3 DG OS HSM Contemporary – have already shown up on Sigma's website under the News section (the links to the actual press releases do not work).
The other two lenses rumored
to be part of the 4-lens announcement are the 24-70mm f/2.8 DG OS HSM Art and 14mm f/1.8 DG HSM Art. If the rumors prove to be true, this will be one of the most exciting round of Sigma Global Vision lens announcements to date.