The Speedmaster 50mm f/0.95 III full-frame mirrorless lens for Nikon Z-mount is officially announced:
Product description (Google translation) and additional pictures:
“SPEEDMASTER 50 mm F 0.95 III is an ultra large diameter standard lens designed as a mirrorless camera for full-size image sensor. While achieving the phenomenal brightness of aperture opening F value of 0.95, it is also equipped with portability, design has been designed considering balance with the mirrorless machine. Utilizing the features of the ultra-large aperture lens, it is possible to take handheld photographs in places where there is little light intensity, or to take advantage of beautifully large blur taste.”
Via stkb.co.jp