She will definitely be foreshadowing the next album during this tour and she's putting a lot of emphasis on "Kill The Bitch". It could be because of the tour or because of the next album. "Kill The Bitch" would be a spectacular title and would get a lot of attention.
Didn't she say that the next album would be about the decay of a pop superstar? Maybe the song is about all the other pop stars getting sick of her and they decide to "Kill the Bitch".