- easily serviceable (not just by Apple, like for example getting windshield fluid refilled - no, I’m serious)
- properly usable; you shouldn’t have to flip it over to charge it (like their current mice) and other silly things like that.
Given how much of a control freak Apple is, and how their motto is basically that they’ll tell you what you want (instead of simply giving you what you want), until that changes drastically (read: management changes), I don’t see a release happening anytime soon (unless they want to risk it potentially being another flop[1]).