The next nexus needs....
...a maximum of 4.3 inch screen size and non-plastic build.
I know i might get flamed for it a lot, but i use a GS3 and the build doesn't feel as nice as the One X, Lumia, or the iPhone. While the phone itself is great, holding it while using is a pain.
The 4.8 inch screen is too much. I hate using it in portrait mode every time i need to take a picture, or play a game, or watch a video. It is not so ergonomic and coupled with the thin profile it is much easier to slip out of my hands. Also one hand use on the Galaxy S2 was possible, on this don't even think about it.
Why are we being pushed to buy a mini tablet if we want a decent android phone? Looks like anything 4.3 inch and less is nowadays produced as "mid range". Why throw away the choice of a super phone with a decent and usable screen size for once when everyone touts the choice feature of android so much?