I got to try this out today in Akiba, pretty impressive. The controls are extremely simple (essentially 4 buttons for everything), but the combat system feels pretty damn deep. The difficulty seems to be coming from the Ninja Gaiden school of "the simplest enemies can kill you if you aren't paying attention."
Since it doesnt have a firm NA release date yet, i'm half tempted to pick it up in Japan and give my PS3 some region free loving.
On the other hand, my grasp of japanese is so poor that i'll essentially be missing out on the story.