The Sigma 70-200mm f/2.8 DG DN Sports has been rumored for a long time and looks like the wait is over. Sigma is planning a live-streaming event on October 6th. Sigma is likely to announce a 70-200mm F2.8 for E-mount.
This is going to be an affordable alternative to the current super expensive (and excellent performance) Sony FE 70-200mm F2.8 GM OSS II Lens.
Sigma Lens Format Abbreviations
Sigma is one of the largest third-party lens manufacturers and, as such, designs lenses for a variety of sensor sizes.
These lenses are designed especially for cameras with APS-C sensors. The smaller image size makes possible a compact, lightweight format that offers outstanding flexibility and maneuverability.