I've checked the official website of Level 5 and says somewhere 2007, no release date set. Wouldn't they be the first to announce that on their website? Neither I find the game on shoppingsites so to me it's nothing but rumor 135.689 of this year only.
http://www.level5.co.jp/products/dq9/index2.html
Don't forget One Piece Unlimited Adventure
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