The RX10iv has been announced and pre-orders have begun.
Last summer in Panama I was shooting a hummingbird in flight with an RX100v and thought it only a matter
of time before that sensor and the AF/AF-tracking makes its way into an RX10 series body. That time is now
and I'm fully jumping on board.
Years ago I owned the RX10ii and thought it outstanding except the focal length, AF/AF tracking, and buffer.
The RX10iii took care of the focal length but the other problems still existed. The iv changes all of that.
The only thing I wish Sony had added is a second card slot....the RX10 series bodies are easily big enough. For years
I never had a card fail but last week in Yellowstone a $220 Lexar 2000x UHS-ii failed, wouldn't read or wright and could
not be formatted, so it does happen.