Team Ninja wants Ninja Gaiden Sigma 2 to be "sleek and sexy," and not as violent as others in the series.
Producer and director Yosuke Hayashi has told CVG that the team working on the PS3 version is "kind of egoistic" and gets "bored with the same continuous concept": that's why it's shying away from a direct Xbox 360 port.
Hayash doesn't want it to be namby pamby, but he does want to "start evolving this game."
More through the link. It's out later this year.