Their agency A Cube Entertainment stated, "'PINK BnN' is a logo which stands for A Pink's sub-unit activities, various projects, and such... The specific details are planned to be unveiled with the music release."
Now all that's left to find out is who will be in this exciting sub-unit. Fans are throwing guesses that the 'BnN' can stand for Bomi and either Na Eun or Namjoo, or all three of them!
A Pink will also hold their first Japanese showcase in Tokyo on August 4!
[Thanks to everyone who sent this in!]