It seems that Brad and Ang are looking at the children they have and realizing they've left poor little Zahara out. See Maddox now has a brother, Pax, which he looks more like. Shiloh looks like her birth parents and then you have Little Z in the corner and doesn't look like any of them. So, in order to make her feel better they want to adopt another child, this time from Africa.
I guess this means we'll see another tattoo going up on Angelina Jolie's arm soon. Guess this dismisses the pregnancy rumors.