Do anyone know if there will be an increased settler population and the opportunity for building more in your settlements in later patches or DLC`s?

Anything is possible, but in this case, I kinda doubt they'll increase the population limit. Also I'm pretty sure the size limit is there as a guard against frame rate and object render time issues. I would almost guarantee that DLCs and maybe even some future patches will add more things that can be built, however.

Lets hope for the possibility to build more in your settlements in future patches. Thanks for responding.