According to their Spanish label INGENIOmedia, the girls will be making a comeback in Korea with "Acceleration" in July. There's not much information about the song right now except that it was produced under INGENIOmedia instead of their Korean label.
After, the girls will be in Spain to make a reality show, and then have a comeback with what seems to be a follow-up song to "Acceleration" in September.
The girls also posted a special 2014 version of their MV for "Style" which includes an introduction by the group in Spanish.
Stay tuned for more information!