So Hikki's official site announced that she's releasing a new single on 1/18 -
http://www.utadahikaru.jp/en/news/detail.html?id=499489
Face My Fears
===Tracklist===
1. Face My Fears (Japanese Version) / Utada Hikaru & Skrillex
2. Face My Fears (English Version)
3. Chikai
4. Don't Think Twice