Don't misunderstand it's a great Camera. And it could be even closer to perfect with several features added.
Weather sealing.
A bit larger grip, today i have a grip/L-plate combo from Really Right Stuff. Due to the size of the lens the grip doesn't add ekstra depth. The grip adds a bit weight but it makes the camera much more safe to handle.
Also the grip works together with my ballhead from the same manufacturer using the Acra-Swiss quick release coupling.
Multi Terminal ,so there is a possibility to be remotly controlled by the Sony Remote (RM-VPR1) or even better a successor from Sony or a third party manufacturer ,a remote that can do timelapse.
Multi exposure is also a feature that i miss ,I had it in my camera in the old analog days (Olympus OM-1)
Better Battery capasity - something that is needed in doing timelapse.
Built in Viewfinder - it would make the Camera slightly larger but some of the space can be taken from the internal flash -I never use it anyway. And also the LCD-screen would become smaller. But with built in Viewfinder like the FDA-EV1MK (Oled type) it could be used for informatio/menu purpose only.
Shutterspeed dial - instead of PASM dial.
These are some of my wishes for my future Camera ,RX1 successor or another similar.
Photosonic