According to recently rumors from SonyRumor.co, Sigma will announce their first full frame E-mount lens in 2017. Sigma CEO already said that they are planning to make Sigma FE lens for Sony full frame mirrorless cameras at Photokina 2016.
As Tokina recently has announced their first FE lens Tokina FiRIN 20mm f/2 FE MF Lens at Photokina 2016, Sigma is also planning to release some FE lenses. According to a recently interview with Sigma’s CEO by Focus Numerique, Sigma will release several FE lenses in the near future.
According to NikonRumors, the Canadian nature photographer Brad Hill said that Sigma will announce a new flagship super telephoto prime lens Sigma 500mm f/4 DG OS HSM Sports lens for this upcoming Photokina 2016. This will be a great alternative lens compared to expensive EF 500mm f/4L IS II USM ($8,999) and AF-S 500mm f/4E FL ED VR ($10,296.95).