They probably want to go for the best visual experience possible and that's why they chose PSP. Not to mention it has a bigger ADV dating sim fan base which makes you wonder if the game will really be a dating sim...
Since the thread titles been changed from "PSP" to "Games of", I might as well point people to the two fan made Ace Attorney style PC games too
http://www.cubetype.com/archives/200...me_saiban.html