Hi @fkinimod and welcome to the forum!
The topic of camera upgrade was discussed quite often in the forum.
Here´s one good thread Is it worth upgrading my FP3 camera to FP3+? and you can find more: just use the search function 
There are also threads which compare photo qualities of those different camera modules (and also by changing the camera apps)
In a nutshell about your questions from my point of view:
You won´t turn your FP3 into an ipod about the speaker quality (but you will also never be able to make a call with you ipod)
Mostly the same goes for the camera upgrade. Don´t expect a very big change.
The reasons for this (hardware & software details) are already discussed here a lot, just take a dig in the search results
Best
DonFnord