Here are the specs of the new Sigma 100-400mm F5-6.3 DG DN OS lens for Sony E-mount:
22 elements in 16 groups (including 1 FLD lens and 4 SLD lenses),
minimum shooting distance 112 cm (wide-angle end)/160 cm (telephoto end),
maximum shooting magnification 1:4.1 (at 400 mm),
filter diameter 67 mm,
size φ86×197. 2mm,
AF compatible with 1.4x and 2x Sigma Teleconverter (L-mount version),
compatible with optional tripod mount.
And here is the info about the converters:
The Sigma Tele-converter TC-1411 has 7 elements in 4 groups, size φ65.2×33.1mm, and weight 175g. TC-2011 has 8 elements in 4 groups, φ65.2×46.9mm, 205g. North American prices are $399 and $429. USB Dock UD-11 supports USB Type-C. You can update the lens firmware and adjust the speed of the MF function.