Sigma today has officially announced the development of 24-70mm f/2.8 DG DN Art lens for Sony E-mount. This is second zoom lens from Sigma exclusively designed for Sony full frame mirrorless cameras. Currently no price and release date info about this lens.
Tamron today has officially announced the development of FE 17-28mm f/2.8 Di III RXD Lens (B&H Photo Video). This lens will be officially released in middle of 2019. You can get instantly notified when available for pre-order online. (Due to very high demand of this lens as 28-75mm f/2.8 Di III RXD, you’d better pre-order ASAP.)