The latest issue of Japanese gaming mag Famitsu confirms Ace Attorney 5 as coming to 3DS, according to Andriasang. Up until this point, we only knew that it existed and that, well ... that's pretty much all we knew.
Now we know that Phoenix Wright returns as the protagonist, one year after the events of Apollo Justice, and interacts with a new partner dressed in a primarily yellow outfit. There's still no word on when the game will come out in Japan (though it will be playable at Tokyo Game Show), or if it'll ever be localized for western countries.
The most recent game in the series, Ace Attorney Investigations 2, was not translated by Capcom.