Just take it with a wink.
I can only tell you, what her official site says.
The title is meant to be understood as "newly made promise or oath" in reference to her first Dear Lonely Girl.
As the first one was made over ten years ago and made from a school girls perspective, the new one is from the current Miliyah and will show, how much time has passed.
Just right before the single, her new book '28' is going to be released as well and it is connected to that.