Well, the episode ends with So I take it that Episode 5 will contain scenes of Graham revisiting events from previous games in dream form, but as far as what he will do there, there are a couple of possibilities. One is that he will change past events so that they will not have happened. In that case, he could, for example, prevent Alexander's kidnapping from taking place. However, that would be such a drastic change that I think it is highly unlikely. Another possibility is that he will simply comfort his children in their dreams. However, that seems too lame to be a real possibility. In between those two extremes, what could he do that would be dramatic enough to end the series without totally changing it? I guess we have to stay tuned.
A question: Was the final scene produced with the new engine and imported into this episode as a video resource? The quality looked very good.