I'm a fan of Professor Layton and Phoenix Wright and was quite hippelig when I learned that both are to be combined in one game. So far I have just 2 hours and could hardly take my 3DS from his hand. As you know it from Professor Layton examines one the places to hint coins and solving puzzles. If it goes to our beloved Phoenix Wright we are as usual in the courtroom and interrogate witnesses, present evidence (if one can investigate the crime scenes, I can not say exactly, because I have not yet come). Layton, as well as Phoenix are well integrated into the story and it captivates you. The music is again great and fit in with the respective heroes :)
Who likes Layton and Phoenix, will like it. But surely even a fan of Layton will learn to love Phoenix. I recommend it definitely!