“Shin Budokai” seems to have a date set of 04 April 2006 in Japan. In terms of the American version, it looks like GameStop.com has slightly updated their listing to read a “Pre-Release” of 07 March 2006. A comparison of the two countries’ cover arts for the game can be seen below:
“Shin Budokai” JP & US Release Updates
07 February 2006, 7:45 AM EST