I just started playing Professor Layton relatively recently - I have only beaten the first game.
It is a great series.
I have played all of the Ace Attorney games, including Ace Attorney Investigations.
It is also a great series.
I made a joke at the end of "The Mysterious Village" that Professor Layton was like McGyver and Sherlock Holmes combined, and that he would get through a Phoenix Wright mystery in one tenth the time that it takes Phoenix himslef to (as in he'd walk into court knowing everything). Now my theory will be tested.
Professor Layton could only possibly be improved by courtroom battles and WE ARE GETTING THAT YEEEEESSSSSS.
Imagine what the music will be like! Compositions reminiscent of both series! This will be so awesome.