It's definitely on its way to Japanese users, with Capcom Mobile "looking into" porting it for a Western release. Good, good, good. I stopped playing Phoenix Wright about the time I stopped playing my DS, which just happens to be around the time I got my iPhone. No need to carry two devices around anymore, you see.
Bring the series to the iPhone and it'll be like the return of the prodigal son. Only, he'll have magnificent hair.