I think you must be understanding "foreshadowing" in a different sense from me; that's precisely what I mean. Rose moves from being shocked to find the Tardis has interfered with her mind to a point where she actively seeks telepathic bonding, and since Russell T. Davies wrote both episodes I think he had the end of the plot arc in mind when he wrote the lines in "The End of the World". Though I don't believe it has to be planned like that to count as foreshadowing; I would argue that Vila's suggestion in Cygnus Alpha that the prisoners should kill the cold-hearted murdering Avon before he has them dumped out of an airlock is a delicious instance, and I'm sure that its connection with events of the late fourth season is entirely accidental.