The game will be for Sony PSP. You’ll be playing as Wild Tiger, Barnaby is a non-playable character but still your partner. You’ll be catching criminals and earning points in the Hero Ranking. Release is Autumn 2012, but this is probably subject to change.
By the way, PSP is region-free, so it doesn’t require hijinks to get this game to play on foreign PSPs. I’m definitely going to order it, I have my doubts that this won’t get ported to the English speaking market any time soon, if at all.
(Thanks to PJA for the tip!)
Update: Source and some more info added.