The 60.9MP full-frame Foveon sensor with X3 1:1:1 technology for the Sigma mirrorless camera with L-mount will be manufactured by TSI Semiconductors in California

The new full-frame 60.9MP Foveon sensor (3 layers x 20MP sensor) with X3 1:1:1 technology for the upcoming Sigma mirrorless camera with L-mount will be manufactured by TSI Semiconductors located in Roseville, CA. Watch the Sigma presentation video for additional information:

Some screenshots from the presentation:

Check out also this interview with Sigma's CEO (recap by 43ddict):

Sigma has new 11 lenses coming by the end of the year and an adapter
14mm f/1.8, 20mm f/1.4, 24mm f/1.4, 28mm f/1.4, 35mm f/1.4, 40mm f/1.4, 50mm f/1.4, 70mm f/2.8 macro, 85mm f/1.4, 105mm f/1.4, 135mm f/1.8
Totally committed to L-Mount
They developed their mount converter so that their lenses could be used on any system
L-mount Foveon Body was delayed till 2020 instead of 2019
L-mount camera users can use Canon and Sigma lenses without compromise

The new Sigma mirrorless lenses for L-mount now listed at B&H & Adorama