I wanted to take a crack at this "more rounded" design leak from factory uncle. I just went for the full circle design inspired by the Super Nintendo controller, and then went full super with the buttons/layout and for further call backs I added the N64 C buttons design on the other controller. I made the sticks bigger on this than OG joycons...but I think the d-pad might be dead other than on Pro Controller's because they want buttons and sticks on both sides if they are joycons.
Also that would be about the right screen size in a current switch form factor. The thought that the JoyCons could house additional battery for the whole system that we've been kicking around here, well if they look like this there will be plenty of room for extra battery in them.