Games Radar picked up a pamphlet from Capcom’s booth at the Tokyo Game Show, advertising Professor Layton vs. Ace Attorney for the Nintendo 3DS. On the paper was an English-language press release for the game containing details of the title.
One part of the press release mentions that "English names are TBD," suggesting that the game is being considered for an international release. Not very surprising, considering that it remains the game that Level 5’s closest followers want to see localized most.
As of this time, no details such as a release date or price have been announced by Level 5 for Professor Layton vs. Ace Attorney’s overseas release. You can learn more about the game and its new court system in this post.
Thanks to Eric for the great tip!