Hello there,
the endings will be reworked for 2.0, nothing is set in stone but there's the likelihood of one of them being a purchase of a mansion and getting 2 of the girls to live with you. More endings will probably be added for each individual relationship (the ones like Kate, Amelia, Himari, Toni where you select to be their partner), but again, nothing is set at the moment.
But unless something drastically changes, there wont be a "big harem" ending with all the girls just being fine with each other.