Recently, Sigma UK has posted an interview with Sigma’s CEO Kazuto Yamaki. Sigma CEO confirmed that Sigma is currently working on FE 70-200mm f/2.8 DG DN Sports lens for Sony E-mount mirrorless cameras. And this lens will be announced soon when is ready.
Currently, Sigma has already released 14-24mm f/2.8 DG DN Art lens and 24-70mm f/2.8 DG DN Art lens. So next lens should be Sigma 70-200mm f/2.8 DG DN Sports lens.