"But even now, my vestige of a heart. Something is going to happen ... in 12 days."
It is interesting to note that the video's title (12) coincides with its release date, the 12th of September.
The dialogue may support the increasingly likely cyberpunk theory i.e. he doesn't have a proper heart, because he's not human; he only has a semblance of one. Alternately, could be PB just expressing a bit of self-loathing, perhaps with regard to his past interactions, particularly Unnamed Female--maybe he was the one who betrayed her.
As a user pointed out in YouTube, this video may be part of a poem, along with the last two: