People complaining about customization variety shouldn't be enough of a concern to simply not include it. Sure, they should make some effort to balance it, but some races have a wide variety of skin colors in game and others don't. Having forced and awkward skin options for race groups that didn't exist, or restricting some race groups that are obviously integrated into the faction communities already are both poor decisions only made worse if their only goal is some vague concept of fairness.
As to the other question, no, there certainly hasn't been a promise of playable secondary race groups. Responses to the concept have been universally positive, but they have neither a timeline nor a guarantee.