It appears IU is preparing for her comeback.

LOEN Entertainment music producer Cho Young Chul recently wrote, "Jieun (IU) is of course the most comfortable and happy in the recording booth". He attached a photo of IU inside a recording studio, dressed comfortably. She seemed to be in the middle of recording something, complete with headphones on her head.

IU had also hinted to her comeback recently. On the January 6th installment of 'Inkigayo', she had said, "My comeback is soon. I'm preparing for something cool, so please look forward to it." She had also written on her fancafe, "Soon I'm going to open the door and come out again. Wait for me while drinking a glass of juice in the living room!"

Source: Cho Young Chul's Twitter