[Update: it's 800 MSP ($9.99) and you can find it here on Xbox.com]
You'll take control of Raiden's desperado samurai nemesis Samuel Rodriguez as you embark on a new adventure. Based on the screens revealed so far, it looks like you'll be exploring past locations for at least a portion of the DLC -- I just hope there's new content here.
There's no current pricing scheme outside of the rumored $6.99 price point, but you can expect our review shortly after launch to give you a heads up on whether or not it's worth picking up. In the meantime, you can bone-up on your skills with our guide.