This is exactly the sort of thing I would expect from them, and they will miraculously find a way to get "Standing" because everyone knows the Judiciary is infested with Liberal worms.
Really, there is need for any concern in this regard. The citizenship law that governs the period of Cruz' birth (1970) clearly states that, in the event of an overseas birth, American citizenship can be conveyed by a.) a single parent who has b.)resided in American for at least ten years, five of them after the age of 14.
Elizabeth Wilson Darragh Cruz easily passes the threshold.
Cruz's eligibility is your basic "open and shut case". Challenging it in a court of law would draw, at best, a guffaw, at worst, a contempt charge, from any competent jurist.
You look at our legal system as functional, while I look at it as completely broken, and unable to come to any rational conclusions about anything.
That the legal system could be on both sides of an issue at the same time I have no doubt. The Legal system has become "Calvin Ball" and the laws mean whatever they feel like on any given day.
It will surprise me not one whit that they can refuse to hear any case about Obama (or in the few times they did "hear", bother listening) but decide every case filed by anyone for any reason must be adjudicated if it is detrimental to a Republican.
We've already seen the Racist and deeply politically biased "Justice" Department, and Obama has produced a veritable maggot infestation worth of New Liberal Federal Judges, so if you think "Justice" is so cut and dried, I have a bridge to sell to you in Brooklyn.