The forthcoming 3DS version of Dragon Quest VIII: Journey of the Cursed King will add a new ending.
The news was revealed in the newest issue of Jump magazine shared on Twitter by @kazu4281. The exact ending is still unknown, but Gematsu hints at "surprise developments," "an angry King Clavius," and "a sad protagonist."
In addition to the new ending, the 3DS version will also include a new post-ending dungeon to explore. Called the Ultimate Trial, this dungeon will contain "purple treasure chests."