For me, this era has been largely influenced by the 90s, especially the fashion. The video teaser seems like a play in a line from the 90s movie 'Jawbreaker':
'I killed Liz, I killed the TEEN DREAM, Deal with It.'
I think she was just saying goodbye to the TD era tbh, she said this would be a darker era at the beginning of the creation of PRISIM, a lot can change from the first stages to the finished product, she is human after all.