We all know Metal Gear Solid 4 is the last game for Solid Snake, but this doesn't mean it's the last Metal Gear game as some people think. Also, we haven't had a Metal Gear story in a few hours.
Kojima Production's Ryan Payton cleared this up in an interview with MTV Multiplayer saying, "I think there’s been some misconceptions that this is the last Metal Gear. This is really just the last chapter of the saga of the Solid Snake story.”
He added, "[Solid Snake] was a burden [for Kojima] because of all those loose ends. So when you play Metal Gear Solid 4 and when you get to the end, I think you’re going to feel that ‘wow, this is a nice closure.’ All of the weird stuff that’s gone on in the past, it’s all coming to an end. All those weird questions - everything is answered."
Check out the whole interview for details on the inclusion of the Assassin's Creed Altair costume.