Ever since Splatoon's characters were first announced, I've been seeing comparisons between the girl squid and Squid Girl from the manga series Shinryaku! Ika Musume. It seemed natural that these two series would eventually team up, and it's finally been confirmed that a Squid Girl outfit will be added to Splatoon in this week's update. De geso!
The outfit was leaked in the latest issue of Famitsu, which shows both the girl and boy squids wearing the complete Squid Girl getup.
For now, the outfit has only been confirmed to be coming to Japan, but we should know soon enough if it will be available in the west as well.