In Mid July Sigma will announce those four new lenses:
35mm f/1.2
45mm f/2.8
12-24mm f/2.8
24-70mm f/2.8 (this lens will be available later after the release of the other three lenses)
They should be available first for Sony E-mount and the L-mount. A Nikon Z version of these should be available from early 2020 on!
via MirrorlessRumors