The next Super Booster Pack is testing on the training room: Science! Here's a link to the costume changes! It contains new science themed costume pieces, emotes, and costume change emotes… as well as the new Super Tailor feature that will allow you to change the inherent body type of your character to Male, Female or Huge for each costume slot! So if you like to cross dress, feel transgendered, or think you are Ant-Man, it's all about you!
Here's a video of some of the new emotes and stuff: