It is however the Final Game featuring Solid Snake.

When Kojima announced that MGS 4 would be the last game to feature snake everyone thought that it would be the end of the series. After 20 years of great story telling we all thought that the Metal Gear Series would come to an end.

However, Good news arose today for the fans of the series.

 "I think there's been some misconceptions that [Metal Gear Solid 4] is the last Metal Gear," said associate director Ryan Payton in an interview with MTV. "This is really just the last chapter of the saga of the Solid Snake story."

"[Solid Snake] was a burden [for Kojima] because of all those loose ends," concluded Payton in the same interview. "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."

Well I'm not sure how people would react to a new Hero but as for many who didn't like playing as Raiden, they will be so disappointed.

Metal Gear Solid 4 will be hitting stores on June 12 as well as a series of Mobile Games.

Source