They already stated they're targeting for a June release. But they're just getting held up by SquareEnix, as they're the ones localizing the game.
Its pretty sad that its taken this long, as DQIX is one of the highest budget titles on the DS. Not to mention was getting a large amount of free hype and publicity when it launched in Japan as it was. If they were smart, they would have launched it in the west soon after the Japanese launch to take advantage of the hype, but now all of that is lost.
And most likely, most of the delay is just due to the emphasis on Kingdom Hearts 328 and Final Fantasy XIII. Not to mention all the changes they're doing to DQIX localization (accents, puns and name changes).
Six upcoming games you should look into:
