In Metal Gear Solid 2: Sons of liberty, Raiden eventually finds out that Pliskin is Solid Snake. Raiden then proceeds to ask Snake how did the dead body identify itself as Solid Snake. Otacon then replies that it was Liquid's body as Snake as Solid Snake and Liquid are identical on the genetic level. Otacon also adds that he and Solid Snake stole Liquid's frozen body from some organization and it was kind of a hassle. 

The thing is that there is no more information on that operation where Snake and Otacon stole the body. There should be another Metal Gear Solid taking place after the 'Tanker Incident' where Snake has to steal Liquid's body to make everyone including the Patriots and he is dead.

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I find this important as there is information that can make another Metal Gear game and that there can be another Metal Gear Solid game featuring Solid Snake since he's only been featured in two of them (MGS Games not MG).

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David Hayter should voice Solid Snake and Christopher Randolph should voice Otacon.

The game should have new bosses and be the same length as any other Metal Gear Solid game such as cutscenes and a strong story.

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This story will surely fill in the missing link to complete the story of Solid Snake.