Sony announced the development of the FE 300mm F2.8 GM OSS Telephoto lens, with a target launch date in early 2024.

Flagship G Master Telephoto Lens
Sony claims the new lens will feature high-resolution and spectacularly beautiful bokeh of Sony’s line of flagship G Master series lenses, whilst also offering a far-reaching 300 mm focal length and F2.8 large aperture.

Sony also pledged to expand its attractive lens line-up in order to meet the demands and maximise the creative possibilities for all types of creators, including professionals, and expand the possibilities of artistic expression.
Additional details and specifications on the new FE 300mm F2.8 GM OSS Telephoto Lens will be released at a later date.
