@Antoine
The 48MP won’t allow less pixelisation, as it it is a quad bayer sensor (explanation in the link given higher), which means it compiles 4 pixels in one (more or less). But it will theoritically allow a higher image quality when zooming, as well as in general better photos. You might want to look for the option to shoot in 48MP with a 48MP output and allow for less pixelisation. I’m still wondering whether anyone found it (perhaps in the developer options).
Though the difference will perhaps be little and not very noticeable in everyday’s photos. I agree there is a part of marketing in their new modules, but I don’t believe it is only marketing. I will wait for a good camera modules comparison, as we can’t judge based on nothing (currently I think there is none).
I don’t care much about the new modules, I don’t own a FP3 and I probably wouldn’t have bought them anyway. But for those wanting them, I was expecting a much improved software. Let’s see if it’s the case or not (seems not to be as much improved as I expected).
(I have no experience in photography, I only read different things and this is what I understood. Please correct me if I said something wrong)