Sigma has a new teaser for their upcoming lenses (click for a larger view – the labels are just a guess):
It seems that the small lenses on the teaser have already been released (Sigma 12mm f/1.4 DC DN lens and Sigma 17-40mm f/1.8 DC Art?)
Here are the details on the three new lenses for Sony E and Leica L-mount (announcement on September 9):
Sigma 20-200mm f/3.5-6.3
Sigma 35mm f/1.2 II
Additional information on the upcoming Sigma 135mm f/1.4 DG Art full-frame lens
