As a stills photographer, I'm most interested in their high-pixel R body, which I (personally) would require to have:
* 35-80MP, anywhere inbetween I'm happy. (BSI preferable). Show off how good you can make your dual-pixel AF work (eg have 1/2 of the dual-pixel sensors horizontal and 1/2 vertical).
* IBIS, hopefully working as dual-IS with IS lenses.
* 5+ MP EVF, with no black-out (preferably with much wider apparent angle-of-view).
* fully articulating screen (preferably with high resolution and as big as possible). Touch-screen interaction with as many features as possible.
* no embedded lower battery grip (it can be offered as an add-on).
* good continuous eye-AF (it doesn't have to beat Sony, but just be good enough)
What I'd really like added to it (some of which I know won't happen):
* at least 1 slot (preferably 2) for the very latest high speed memory card. If the 2nd memory card exists and is slower, then allow raw image to store just to the faster slot and be copied later in background (when not busy) to slower slot for backup use without slowing down shooting. I would be even happier if they had a good size internal super-fast memory for storage of raw image, with background copy to a single external card (which doesn't have to be the expensive latest fastest speed).
* Arca-swiss grooves at the bottom edges of the body so you can mount to any A-S mount, such as on tripods. It's easy to add them without affecting anything else. If possible, add another set of grooves on left side for portrait use on tripod.
* charging over USB 3 . Give the usb 3 connector a physical detent so when a cable is plugged in you can feel it snugly snap in place when fully inserted and not want to come out by accident. Allow USB 3 cable connection to computer (PC or MAC) or smart phone for control of everything (including seeing images) at full speed & 100% reliability.
* the EVF on the top left so you use with right eye while looking straight forward without smashing your nose into the body - made even better with an optional bigger fully light blocking rubber right-eye-cup which can be rotated(eye-cup only) 90 degrees for vertical shots. Now you can open your left eye (if desired) to see the normal view at the same time you frame your picture and take it, even after rotating camera 90 degrees left for portrait mode (oh, can you feel the ergonomic rating rise!).
* No PASM dial, but instead use dedicated (half-hidden) left-right rotary dials for speed, aperture, EV offset & ISO, each with a 'auto' toggle on/off (maybe by a push detent of the dial itself?). You could have 2 dials sticking out the top right front and 2 more sticking out the top right back. That's all 4 controls!
* A lever around the exposure button - for single frame, continuous frame, or video (or other start-stop control, such as single frame after 5(menu adjustable) second delay for selfies - yay!).
* neutral density algorithm (blending multiple images for tripod use)
* all bracketing options put together in one menu. Including aperture bracketing. Focus distance bracketing can be used (+/-) around the *center* distance (which is when button is pressed to start taking images, like when using eye-AF). If you dare to innovate, you could allow 2 brackets to be done for the same image (eg 3 in one bracket, and 4 in another means you take 3 * 4 pictures).
* low-light star tracking algorithm
* make strap connector locations at all 4 corners and recessed so they don't interfere with using buttons & dials (now you're free to attach the 2 camera-strap ends however you like).
* GPS, finally! Even better if you can do full offline location navigation with internal downloaded maps.
* A "silent" button. Those of you that don't want this can re-program it to something else.