I don't know anything about the credibility of this source, but they seem to suggest Nissan will take a more conservative approach to the design of the next Leaf, with the double range improvements we seem to expect: Nissan Leaf to get sharp new look and range boost | Auto Express
Looks like a cross between a Volvo and a Toyota Auris. The increased range of 180 miles will be welcome, though that's under the Euro cycle and the existing Leaf gets 120 miles apparently. I'm guessing the 180 miles will work out about 100/110 miles in real life. Still poor.
OK GrumpyCabbie puts this into good perspective... I wanted to say 180 EV miles sounds unlikely to me (or too expensive) but now I see 180 may not be 180; There is another thread going on this.
Nissan has teased its main concept for next week’s Tokyo show - a car that’s rumoured to preview the next generation of the electric Nissan Leaf. Tokyo motor show - Next Nissan Leaf previewed by autonomous concept | Autocar
I would be surprised to see updates anytime soon. They're clearly still working on it, and the Bolt production is still quite far away, so they have no reason to show updates now (unless they want to decimate the 2016 model sales).