Update: According to Konami, the VR Missions are PS3-exclusive only in North America. In Latin America and Europe, the DLC will be available for the Xbox 360 as well.
Konami have revealed a little more information on the Metal Gear Rising VR Missions DLC via the PS Blog.
The VR Missions DLC in Rising will consist of 30 missions featuring a virtual-reality look inspired by the original Metal Gear Solid: VR Missions. The missions will be set in original stages that aren’t in the main game and will also allow you to control the Dwarf Gekko.
Konami haven’t announced a price for the VR Missions yet. In North America alone, these missions will be exclusive to the PlayStation 3.