Japanese developer Level-5 has announced that they're working on a new title in the Professor Layton universe for iOS devices - it just isn't going to feature Professor Layton.
Instead, the game will focus on his son, as he attempts to solve murder mysteries. It will work in a similar fashion to how the previous games work with the stylus on the Nintendo DS platforms.
It's being developed with a release next year in mind, and it'll be coming to all of Apple's platforms. So that's the iPhone, iPod Touch and iPad.