The 3DS version of Dragon Quest VIII: Journey of the Cursed King will add a new ending, the latest issue of Jump magazine reveals.
How the game ends is unknown, but here are some hints (potential spoilers, of course): “surprise developments,” “an angry King Clavius,” and “a sad protagonist.”
Additionally, after clearing the game, there is another new, still unknown dungeon to be explored. This dungeon, dubbed the “Ultimate Trial,” will feature “Purple Treasure Chests.”
Thanks, @kazu4281.