Taking a guess here -- the entangled photons would act as nodes between satellites, enabling the combining of information collected by the satellite array. Essentially, take an interferometric array such as CHARA, replace fiber with empty space, and voila. I remember some of the technical obstacles CHARA had to overcome, one of which was extremely precise path lengths from each telescope to the central collector. Not sure if they could achieve that in space where no solid anchoring material exists.