f(x) fans have been screaming over news that their favorite idol group will be making a return to the music scene with a second mini-album on December 2nd. Reportedly, the mini-album will feature tracks produced from notable hit-makers, Yoo Youngjin (SHINee's "Lucifer", Super Junior's "BONAMANA") and E-Tribe (SNSD's "Gee"). 'J-pop Queen', Ayumi Hamasaki, was also said to have contributed a song. As of now, no official word from SM Entertainment has been released confirming or denying the rumors. Stay tuned with allkpop for further updates! Thanks to everyone who sent in the tips.