Man, any Wii fan here that doesn't hate MGS?
You guys need to rethink your priorities, =P.
On topic, I have a feeling it will be a whole new IP. Kojima has stated how much he like the Wii's controller, I wouldn't be surprised if he made a game surrounding its capabilities. If any third-party team could make a good use of the Wii-mote, it would be Kojima's.