The lenses will be announced on Feb 26!

Here are the specs:

Key features of the Sigma 15mm F1.4 DC | Contemporary:
11 elements in 13 groups
9-blade diaphragm
Weighs only 220g, with a length of 64.8mm (Sony E-mount)
50% lighter than the 16mm F1.4 DC DN, with a filter diameter reduced from 67mm to just 58mm
Optimized for video shooting (extremely minimal breathing effect)
Supports E, RF, and X mounts

Key features of the Sigma 35mm F1.4 DG II | ART:
12 elements in 15 groups
11-blade diaphragm
‎E-mount version weighs 525g, L-mount version 530g
Minimum focusing distance of 28cm
Maximum magnification of 1:5.4
Dual HLA high-speed motors
Breathing effect optimized