Dragon Quest Heroes II's Multiplayer Will Allow For 4-Player Co-op - Siliconera

Dragon Quest Heroes II will allow for up to 4-player multiplayer co-op for story battles and exclusive dungeons. And yes, it'll have cross-platform play between PS4, PS3, and PS Vita.

Square Enix - The Official Dragon Quest Thread, Page 10

Square Enix Reveals Leveling, Power Moves, and Multiplayer for Dragon Quest Heroes 2 - mxdwn Games

DRAGON QUEST HEROES - Call to Arms! Launch Trailer

Dragon Quest Heroes II Details Torneko, Maribel, Gabo, And More Battle Features - Siliconera

Dragon Quest Heroes II - First Co-Op Gameplay - PS4/PS3/PS Vita

Dragon Quest Heroes II details multiplayer - Gematsu

Free quests and characters coming to Dragon Quest Heroes 2 in May

Dragon Quest Heroes II details multiplayer - Gematsu

Dragon Quest Heroes II (PS4) : Video Games

Dragon Quest Heroes II Details Its Story, Key Characters, And World Setting - Siliconera

Square Enix Reveals Leveling, Power Moves, and Multiplayer for Dragon Quest Heroes 2 - mxdwn Games

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ScrewAttack Magazine Issue 9 - 1 Year Later by Gerardo Mejia - Issuu