I know it is EA and we don't know if there will be more Party Members in the future, but I hope they will add more.
In BG you could make a fully evil/neutral/good party. Choose between many npcs for a role (healer, mage ect). You could just take the characters you liked and where not forced to go with "the fighter", "the healer".
You could just take someone for a single quest e.g.g the npcs quest.
The party members where distributed over the whole world in a natural way: You could find where it was logical for them to be and not just the starting region.
Npcs had there own reasons and view and interacted with one and another.
So my hopes are more party members; party members, which join you in later parts of the story; party members with diverse goals and views/alignment/characters.
