Capcom will be releasing a limited edition bundle for the upcoming Ace Attorney spin-off, Gyakuten Kenji.
Gyakuten Kenji/Perfect Prosecutor is an upcoming side-story following Miles Edgeworth and Dick Gumshoe surrounding the events of previous DS game, Ace Attorney Trials and Tribulations. It's due out in Japan on May 28th 2009. A Western release is currently unknown but would be likely due to the huge number of US/European fans.
You can also try out some of the game's mechanics in an online web demo, it's in Japanese but well worth a look if you're an Ace Attorney fan!