Unlikely to happen, regrettably. The 808 was a tech demo targeted solely at the hardcore tech / camera enthusiasts. An Average Joe don't wanting the best possible image quality would never purchase such a thick and heavy phone. This is why the 1020 and, particularly, the 1520 and the 930 are far thinner.
Basically, it's the same as Apple's striving for the thinnest possible iPhone even on the expense of the image quality of their camera. With a thicker phone, they could put a significantly better sensor and/or wider / brighter lens and/or OIS in the iPhone. Still, they cater for where the money is: the Average Joes (particularly the female and/or non-tech-savvy ones) and not us tech geeks.
I'm really sorry to see Nokia's going the Apple way in this regard.
It's disappointing that Nokia gave in to the mainstream and did not release a proper successor to 808.
In a way it worked against them because the mainstream still did not switch, yet they alienated their core audience, Nokia fans that like cameraphones.
Nokia 808 PureView was the pinnacle of their accomplishments; amazing sensor, amazing optics. If 1020 was as good I'd have bought it, but when you look at 1020, you can see grain, noise, overprocessing and something is not right, images look artificial, it is trying too hard. 808 produced amazing images effortlessly.
evleaks (the famous twitter leaker) posted the codenames of 6 upcoming Nokia phones, I wonder if a successor to 1020, the 1030 is among them? And if they will finally be able to beat the mighty 808?