Job's vision of resurrection (Job 19:25-27) differs from the Jews' former understanding of death as Sheol because he knows he will physically stand before God and not be withdrawn from his presence, even after his death. Job foresees redemption, as he calls God his "Redeemer" who will stand on earth and save his physical and spiritual body from Sheol. As for progressive revelation, it is the concept that verses in the New Testament (Jesus' death and resurrection) will be used to better understand the verses that came before it (prophecies in the Old Testament). If we didn't have the Old Testament, we wouldn't understand anything before Jesus' death and resurrection. God let people know that he had a plan, a promise for our redemption.
On a side note, I really enjoy reading everyone's observations. This is a great message board.