http://www.gdex-gamenews.jp/xbox/modules/news/article.php?storyid=706
"NINJA GAIDEN sigma which was announced at Tokyo game Show 2006 as a Playstation 3 exclusive title. According to the article of Xboxfront, accompanying Nobuuzi Itagaki of the producer, after the PS3 edition is complete, he made his intentions to port this game to Xbox 360 clear. At what specific time it is not known yet, but if true, it means that it will be the Hayabusa debut for the first time in Xbox 360."
"NINJA GAIDEN sigma which was announced at Tokyo game Show 2006 as a Playstation 3 exclusive title. According to the article of Xboxfront, accompanying Nobuuzi Itagaki of the producer, after the PS3 edition is complete, he made his intentions to port this game to Xbox 360 clear. At what specific time it is not known yet, but if true, it means that it will be the Hayabusa debut for the first time in Xbox 360."