The newest PSP game for the Dragon Ball franchise, developed by Spike, saw its release in Japan a couple weeks back on 30 September 2010. It is due out here in the US next week on 19 October 2010 for an MSRP of $39.99. Amazon actually has a pretty good deal on the game for a slightly-lower $39.82, but also a free $10 credit toward any future video game purchase.
A demo for the game is available both on the Japanese and American PlayStation Stores, so give it a whirl.
Namco-Bandai also released a new trailer for the game today showcasing “Dragon Walker Mode”: