As previously revealed, the next Metal Gear Rising: Revengeance DLC pack will let you play as the blade wolf and add some new depth to the story. Currently the DLC is set to release on May 9th (in Japan) and will run you 1,000 yen or $10 dollars, which is the same price as the previously released Jetsteam Sam pack.
No word on what else is included, though we will probably see some VR missions and maybe a weapon as an added bonus. While no word was given on the US release, we will probably see it around May 9th, which was the case with the previous DLC packs.