File it under rumor for now fellas:
http://www.gamekyo.com/video13276_star-ocean-the-last-hope-first-gameplay-video.html
http://www.gamekyo.com/search.html?type=game&search=Star%20Ocean%20:%20The%20Last%20Hope
Also on gamevideos.com and searching for Star Ocean 4, and going to "Star Ocean The Last Hope Tokyo Game Show 2008 Trailer", it's listed for both PS3 and 360