TV Guide has an interview with the guy who plays Sully. I get the feelign from the interview that these last two hours are going to be REALLY good and kind of a "holy shit that was cool" vibe you get that makes the rest that came before it all the more enjoyable and make you want to rewatch it.
http://www.tvguide.com/News/Matt-Barr-Harpers-1007905.aspx
http://www.tvguide.com/News/Matt-Barr-Harpers-1007905.aspx