I don't understand all the excitement about the announcement of a new story branch. You can wonder about the phrase "brand new" but not about the message.
Morello was literally begging for Sophia not to visit him or Larry for the last time. That there would be a bonus story was known for a long time. It's just that most of the people in this forum thought it would give them another erotic event. Or finally solve the mystery of Sophia's handbag.
I've always seen the bonus story as a way to advance the overall story or add much needed twists to keep the story logical. For example, why Dylan can't go back to boarding school to stop the blackmail. Or why Aiden can keep pushing his blackmail with so little material. Sophia's corruption can't be it at this point. Or how Zac can get involved in the Aiden route without Dylan and Alyssa knowing anything about it. Or how a break off possibility after the 8th or 12th task should arise. These possibilities can't just fall out of the sky. Also how Dylan's (the little shit) relationship is supposed to develop further without any major twists in the story. All of this doesn't have to be clarified now, and doesn't have to happen that way, but it can explain the message.