I bet they are going to try to time it with the re-release of MGS3 Snake Eater for the 3DS...probably have Naked Snake, The Boss, Ocelot and other enemies from the game. That's my guess anyway.
I really hope it's the license for the whole series. I really want to see the villains from MGS1. Revolver Ocelot, Liquid, Psycho Mantis and so on. Vulcan Raven with the M61 Vulcan cannon strapped to his back would be ridiculously awesome.