At first on tumblr someone said it was on August 13/12 Now it's September 14

There will be a song which is the opposite of MAMA

There will be a different version of MAMA

FULL ALBUM TRACKLIST (EXO-K) : MYSTIC [신비가]

1. MYSTIC

2. 나는 잃었 (I Am Lost)

3. 아름다운 (Beautiful)

4. 마님 (My Lady)

5. 아기가 울지 말아요 (Baby Don’t Cry)

6. Alias (SUHO SOLO)

7. 날 떠나 지마 (Don’t Leave Me)

8. 경계 (Boundaries)

9. TIME CONTROL

10. Let Out The Beast

11. 스위치 (Switch ft. Luhan & Kris)

12. 아무런 감정도 (No Feelings)

FULL ALBUM TRACKLIST (EXO-M) : MYSTIC [神秘]

1. MYSTIC

2. 我迷路了 (I Am Lost)

3. 美丽 (Beautiful)

4. 我的夫人 (My Lady)

5. 宝贝不要哭泣 (Baby Don’t Cry)

6. Perspective (LAY SOLO)

7. 不要离开我 (Don’t Leave Me)

8. 边界 (Boundaries)

9. TIME CONTROL

10. Let Out The Beast

11. 交换 (Switch ft. Baekhyun & Chanyeol)

12. 没有感情 (No Feelings)

4 member of each sub group will have a completely different style

Source: ALLKPOP