As rumored before, Sigma will announce their first full frame E-mount lens 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.
In previous interview with Sigma CEO, CEO said that new Sigma FE lens will have all new optical design, and need two years to develop their first FE lens. That’s why we have seen any Sigma FE lens until now.
Source also said the second Sigma FE lens will be a zoom lens.