While Dragon Ball Z: Extreme Butōden is due out for the Nintendo 3DS in Japan this week, no international distribution has been officially announced as-of-yet.
Plans may be in the works, however, as the game appears to have been rated (“PG”) for Australia:
Dragon Ball Z for Kinect was also rated by the Australian board back in 2012 prior to its formal release announcement.
Dragon Ball Z: Extreme Butōden will launch in Japan 11 June 2015. First-press copies of the game will come packed with bonus content, including a downloadable version of the Super Famicom game Dragon Ball Z: Super Butōden 2 (previously included as a part of the J-Legend Retsuden compilation game). Arc System Works will develop the game for Bandai Namco. The developer previously worked on the Bukū… / Supersonic Warriors games on the Nintendo GameBoy Advance and DS.
Dragon Ball Z: Extreme Butōden is currently available for pre-order from CDJapan. The Nintendo 3DS / New Nintendo 3DS are region-locked; a Japanese system is required for the game to play.
Thanks to forum member Zombie for the heads-up!