According to Konami, Metal Gear Rising: Revengeace will be getting VR missions and sub stories based around other characters through DLC. No characters were named yet but I would bet it’s pretty safe to assume Solid Snake will be one of the characters a sub story will include.
“Dengeki PlayStation has an interesting tidbit in their article about Metal Gear Rising: Revengance. The magazine says Konami will release VR missions and sub stories with other characters as downloadable content. Details about pricing and release dates were not announced.”