You don't know Metal Gear Solid 4

Metal Gear… Ray and Rex are back
Metal Gear Ray and Rex are back, piloted by brothers Liquid and Solid Snake respectively, in what might be MGS4's climatic battle. We're praying you get to fight in real-time, but suspect this showdown is a prelude to a bigger finale.

Johnny Sasaki… is Akiba
In the E3 trailer, he's the only one not affected by the nanomachine "siren." We suspect this "ten year vet" will play a surprise key role.