As previous rumors said, Sigma will announce their first full frame E-mount lens sometime in 2017. According to recently rumors on SAR, first Sigma lens will be Sigma FE 35mm f/1.4 AF lens or Sigma FE 35mm f/1.2 AF lens. And two Sigma FE lenses will be coming this year, the second lens could be a Sigma FE Zoom lens.
In previous interview with Sigma CEO, he said that new Sigma FE lenses will have all new optical design, and it need two years to develop their first FE lens. That’s why we have seen any Sigma FE lens until now.