O MY GOODNESS! I really want Metal Gear Solid Wii... Kojima, the creator, has said multiple times that he is disappointed in Sony... He has said many times that He wants to keep Solid franchise a Sony franchise but he also wants for it to go 360 and wii... And he is leaning towards having it on the wii and 360... MANY MANY times he has told reporters that the wii interests him...
He wants a wii mgs game because he really wants to work on the wii. He thinks the wii has great opportunities for it. And he wants MGS4 on the 360 because it will sell better then the PS3 version and people really want it... Here are just a few articles... go online and check more out!
Google more info! He loves the Wii! MGS WOULD BE AWESOME! (Plus the fact that snake is on SSBB gives a hint that it is a possibility... )