Sorry mate, not this time. Quite not understandable for me.
This is a FP product, not any product of the line from Samsung, Apple, HTC, LG, Huawei…
The model and idea of it is longevity not flooding the market with minimally advanced successors to gain a bigger market share and making superior win.
Sorry to say, but I think this is a totally wrong expectation imho.
I agree, I think they rather put more focus on other modules but maybe FP3 is not far away. It would be good to know, but I leave it up to FP how they keep it with revealing information on their plans. No need to push them. The new camera module was a new move in this business possible due to the unique modular design. I have never heard of another manufacturer having done something equal. Guess why… 
@Magne
I believe the next one if it turns true may be implemented in the next FPx. If it will ever be launched. Until then we have our FP2 with an as I think decent cam mod.
You may like to read my recent post on expectations on new FP products.
https://forum.fairphone.com/t/fairphone-3-interview-of-bas-from-frandroid/28529/169?u=patrick1
This FP idea is also a lesson for me to be satisfied with what I have and take opportunities as they become available, not pushing in any way and eventually complaint while peeking at “others” who move on with faster pace.
I think for some individuals this is the hardest. But still I think no one has bought any FP version unintentionally, let alone for the higher prize.