Oh. I'm not sure about Muramasa. I just know that the combat looks slick.
I don't think it'll be a 2010 release, only because they've shown us screenshots and footage earlier this year. I'd wager it's a Summer release.
EDIT: Here you go, it's confirmed for an '09 release in America. Link shows an old trailer from last year's TGS, so it's been in development for a while now.
http://www.1up.com/do/newsStory?cId=3170332