Edit: This was already part of the previous patent application.
Hi Lows Note spotted a Canon patent application for a 24mm f/1 lens and for a focal reducer.
Specification and lens arrangement of master lens 2 with reducer 5
Focal length: 23.92 mm
F number: 1.02
Half angle of view: 32.33
Image height: 15.14 mm
Lens length: 125.59 mm
Back focus: 2.00 mm