Girls' Generation will finally be making a comeback on January 1, 2013.

Yesterday, they released online their new song, "Dancing Queen" along with member Hyoyeon's teaser images for their 4th album release, I Got a Boy.

The song "Dancing Queen" features the group's own version and style of Duffy's "Mercy." They have also filmed the music video and recording back in 2008.

For their new album, they have decided on a time machine concept that will prove to be a delight for fans.