According to IU, “I’m putting the final touches to my new album” and that “there won’t be a separate producer for the album, instead I’ll be involved in many parts of the album directly and accomplishing things on my own, which is a ‘challenge’ to me.”
Also, “It could be something with a もっと見る serious (theme) than before, but it’ll be an album that contains my own thoughts”."
Korean source: link
Full 記事 translation 情報源 によって squishy with love: link (Thanks, squishy!)