Professor Layton and Phoenix Wright are coming together in a single 3DS game. Level-5 and Capcom hope that you won't object to it (get it? GET IT?!).

Professor Layton vs Ace Attorney is a collaboration between the two studios. It's a combination puzzle/mystery game. Ace Attorney creator Shu Takumi will be writing the story. The brief clip shown at Level-5's Next Dimension press conference (via 1UP shows the two characters participating in a witch trial.

There was no mention of when this game is coming out. Furthermore, it's not even clear that it will be released in the West.
Street Fighter V Has Added In-Game Ads games 3y Street Fighter V Has Added In-Game Ads Will Usher
Resident Evil 3 Remake May Already Be In The Works games 3y Resident Evil 3 Remake May Already Be In The Works Will Usher
Level-5 Is Reportedly Teasing The Return Of A Previously Canceled Game games 3y Level-5 Is Reportedly Teasing The Return Of A Previously Canceled Game Will Usher