Yazen
Banned
It is more than that.
Here are Qualcomm specs for what each SoC natively supports as max megapixels for image processing:
Snapdragon S4 Plus - 20mp (used by Lumia 1020/41mp)
Snapdragon 400 - 13.5mp (used by Lumia 830/10mp)
Snapdragon 800 - 21mp (used by Lumia Icon/1520/20mp)
If you note, out of the listed phones only the 1020s megapixel count exceeds the SoCs native image processing capability and by quite a bit. So updating it and making the experience as fast as an 830/icon/1520 would be very difficult as it seems it was a "hack" of sorts to implement 41mp on the s4 plus in the first place.
However, Snapdragon 810 supports up to 55mp. This can be used for.a future successor to the 1020 with better performance.
That is the reference specifications. Kind really a hack, but Nokia worked with Qualcomm on the imaging processor.
Problem with Qualcomm is that their implementation sucks, discrete imaging processor like the 808 would be the way to go. That is not likely with future models...
1030 could benefit from a 810 CPU if they are going with Qualcomm, and they will be going with Qualcomm.... So inefficient...
However, the camera app speed and little bells like HDR in 5MP are easily achievable as we are getting Windows 10..
OPs concern was with white balancing as well, and it was very good until Amber update.
I'm really hoping their code is poorly written and documented....