If you are talking about the first Apollo Justice game then it is alrady out.
If you are talking about a 2nd Apollo Justice game, one has not been announced yet. However, Gyakuten Kenji, an Ace Attorney spin-off starring Miles Edgeworth, is currently in development and should be out sometime this year!
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The game Apollo Justice: Ace Attorney has not come out on the DS yet, but will be here in America early 2008.
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New updates come out whenever there is a new addition to the game. They are not really on any schedule. When it comes out, it will notify you when you open the game.
The new ones come out february 22nd.
Alibi in ashes will come out on 10/18/11, or october 18,2011.