Ricoh released a new video with additional information on the Pentax K-3 III camera. Here is a recap of the new improvements and features described in the video:
New viewfinder optics with a higher magnification factor of which the displayed image is also brighter, with the addition of a new condenser lens and with an overlaid LCD information display, too
New metering system with 307k colour pixels which has better metering accuracy and also helps the tracking of moving objects
New high-speed mirror and shutter driving mechanism
New PRIME V processor and high ISO performance which is better than that of the K-1 II in terms of noise/details as well as reproduced colours (but that the ISO performance of the K-1 II is really rather outdated by today’s standard, nonetheless). New Fine Sharpness II setting option is also made available for in-camera JPEG sharpening
New SAFOX 13 AF module of which the layout is shown in the below diagram: