Board Thread:News and Announcements/@comment-32478719-20160830113855/@comment-26239911-20160830153002

Here, we got all of the info (thanks to Reddit):

Majin Buu (Ultimate Gohan Absorbed) - Countdown to Despair Links:
 * Leader Skill: INT types Ki +3, HP and ATK and DEF 70%UP
 * Passive: For each Ki orb +12% ATK & Heal 3000 HP
 * Super Lv 1~4: (Super Kamehameha) Immense Damage
 * Super Lv 5~9: (Bais Shout) Immense Damage, Lowers ATK and DEF
 * Super Lv 10: (Bais Shout) Immense Damage. There's a 30% chance that it will change to a "Super Ghost Kamikaze Attack" which is Immense damage, lowers ATK and DEF and raises the Super ATK multiplier by a large amount.
 * Majin
 * Metamorphosis
 * Shocking Speed (luckily)
 * The Wall Standing Tall
 * Kamehameha
 * Fierce Battle
 * Big Bad Bosses