On June 1, 2011, it was announced that the girls will be the newest models for the upcoming cellphone brand from LG called "Optimus Bright" (known as Optimus Black in certain markets) and that they will also be releasing a new Japanese single titled "Go Go Summer!", which will be used in the commercial for the brand while being promoted at the same time.
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Rumors of a fourth Japanese single first surfaced when the group was spotted leaving the Incheon International Airport and were said to be bound for Thailand to film a music video or a commercial.
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