We already reported that Sigma will announce a new 70-200mm f/2.8 lens for Photokina 2018 in September. The new Sigma 70-200mm f/2.8 lens will replace the current 70-200mm f/2.8 EX DG APO OS HSM lens ($1,299), available for Canon, Nikon and Sigma mounts. The detailed specs and pricing info of the two new 70-200mm f/2.8 lens is still unknown.
Two different 70-200mm f/2.8 lenses coming from Sigma:
Stay tuned for more info.