Level-5 reveals London Life, looks like Mother 3

At Level-5’s annual press conference, London Life was announced, which apparently is somewhat similar to Mother 3. However, London Life is unlockable content from the fourth Professor Layton and is not actually a new game. Once players complete the fourth Professor Layton title, London Life will become immediately available. It’s being developed by Brownie Brown and focuses on making others happy through RPG elements. Level-5’s boss Akihiro Hino stated that it will take more than 100 hours just to run through London Life – Which certainly makes it a worthwhile unlockable!

Source 1, Source 2