So it appears the Konami website spoiled it…
RD/KP15-JP066 Fusion Cancel
[REQUIREMENT] When a monster(s) is destroyed by battle.
[EFFECT] Return 1 face-up Fusion Monster on the field to the Extra Deck. Then, its owner can Special Summon all of the monsters that are mentioned on the returned monster as material by name, from their GY face-up to their field.