Courtesy of RSG. According to this neogaf thread (http://www.neogaf.com/forum/showthread.php?t=450234). Hopefully they'll region code it so that North American Xbox 360s can play it too (like they did with DDPDFK).
Called it in the other topic.
Would certainly be nice if it worked on NA 360s again. I've already got my pre-order in for DDPDFK/DDPR.
If you want more direct confirmation, the news was tweeted by RSG (http://twitter.com/risingstargames/status/130602380885622784) minutes after they announced it on stage. spadgy also hinted strongly (http://shmups.system11.org/viewtopic.php?p=735836#p735836) over at shmups that the announcement was coming ahead of time.
They also presented some expert advice (http://twitter.com/risingstargames/status/130609417593958400) on how to play the game.