Sigma has announced development of two new mirrorless "SLR-type" cameras that accept Sigma SA mount lenses

Both cameras feature a Foveon sensor, and Sigma SA lens mount to accept Sigma SA (DSLR) lenses. There is a high resolution electronic viewfinder (EVF) on the rear, along with a wide screen. The two models both have Foveon sensors, with the Quattro H featuring a larger APS-H 1.3x crop sensor, and the Quattro features an APS-C 1.5x crop sensor.

Sigma has also announced a number of optional accessories, including a battery power grip (PG-41), with 200% more shooting time, an electronic flash (EF-630) with S-TTL automatic metering, a flash USB dock (FD-11) to enable firmware updates for the flash, and a cable release (CR-31).

Release date and price is yet to be confirmed.

Sigma sd Quattro Features

• Dual TRUE III image processor
• New Super Fine Detail exposure mode
• Combination of Phase detection AF and contrast detection AF
• Focus peaking function
• 2.36m dot electronic viewfinder (EVF)
• 3.0inch 1.62m dot screen
• Magnesium alloy body
• Dust and splashproof design
• Quick set menu
• 14-bit RAW data
• In-camera RAW processing
• Higher precision white balance (new algorithm)
• Colour modes, Monochrome options
• Custom bracketing display
• Electronic level
• USB3 port

Available at https://www.amazon.com/Sigma-Digital-Camera-Black-ZL900/dp/B01HHR572O/

Sigma sd Quattro H features

• 45 megapixel total pixels (25.5 megapixel top layer)
• 51 megapixel max image size
• APS-H Foveon sensor (26.6x17.9mm)
• 1.3x crop
• 3.8fps up to 10 images
• 5.1fps with Low image size (20 images)

• http://www.photographyblog.com/news/sigma_sd_quattro_sigma_sd_quattro_h/
• http://www.theverge.com/2016/2/25/11111842/sigma-sd-quattro-hands-on