Well, since you all love theories and speculation:
False Awakening Suite: Nightmares of Nicholas about Edward and Victoria.
The Enemy Inside: Talking about his enemy Edward, inside him through Victoria
The Looking Glass: A dream of Nicholas about seeing Victoria in a mirror, then Edward shattering the mirror
Enigma Machine: ?
Too lazy to write any more, but I was thinking about it being a prequel to Metropolis Pt. 2, but still being in present time.