Here's my take on the next nexus......With us already having a button less 720, I doubt they will release a phone with the same screen resolution when there are better ones available. I would like to see a Samsung non pentile 1080 display, to blow everything we ever seen out of the water. Good possibility this will happen because the nexus was one of the first phones to get the 720 screen, and another would leave little room to improve in other areas, hell the nexus is all about screen. that's why it has no buttons.
I'm confused as to why everyone thinks the next Nexus will come with Jellybean. IMO Jellybean was a minor update. One of the first few updates in several months on a phone that is supposed to get many updates straight from Google. The next Nexus will likely have key lime pie as an update or something like that, but defiantly a new version.
Lastly, I would like to see the next Nexus to focus on build quality more than any other area. Screens are getting pretty similar, audio too, we need a phone made of an indestructible carbon like material so we wont have to worry about scratches, drops, anything....nothing shiny or reflective, dark black like the paint on fighter jets.
Wishful Thinking: Something on par with Haptikos technology, the button feedback that makes regular screens feel like they have buttons, that would be a game changer. Games would have real buttons and analogs, keyboard will have a real feel again with muscle memory and all . Its pretty old by now and can be done.