I think the scene in the basement... when Deb's on one side and Dex is on the other... I have a feeling that particular moment will be something Dexter might bring up when she find out about his Dark Passenger.
Coming to Ipod: The Dark Passenger App. Prepare your kill room! Coat the room in plastic. Prepare some take-down drugs. Take a blood sample from the cheek! All with the touch of a button!
Lumen will be back.
I enjoyed the finale very much, but I'd be much more eager for the series to continue had Deb found out. As it stands, I'm pretty satisfied but not frothing at the mouth for Next Time on Dex.