Digital Photography Review reports: [edited]
The RX100 III features the same 1", 20.2MP BSI CMOS sensor as the II, but gains the latest Bionz X processor, a pop-up electronic viewfinder and a faster lens.
The zoom now extends across a 24-70mm equivalent range, with a maximum aperture of F1.8-2.8, a great improvement on the 28-100mm, F1.8-4.9 lenses sported by the existing two models.
It includes Wi-Fi, can run Playmemories Camera Apps, and the rear LCD now flips up by up to 180° for selfies. Video has also been upgraded - including full-sensor readout 1080p stored at up to 50Mbps in the XAVC S format.
The RX100 III will be available in June at a cost of around $800.