What it means is that after spoilers are up one is going to get identified as the Elesh Norn equivalent of the five, about 80% of the base is going try and pick that as their faction. 15% is going to aim for what they consider the counter to that one will be. And about 60% of the people are going to whine that they got shafted because they didn't get a chance to claim the "good" promo.