If this game isabout Big Boss, is there really a place that the story would fit well?
MGS3 covers his main story, and his coming to be the "hero" that he is.
Peace Walker covers the rise of Outer Heaven.
MG1 covers the fall of Outer Heaven, and MG2 covers his death, as it were.
The only place that they could really plug something in without just doing a MG1/2 remake (which would be the best thing ever, of all time, by the way) is just Outer Heaven carrying out some operations. Not to say a good story couldn't be told with that, but it seems kinda pointless. >_>
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Falcon Punch
http://www.youtube.com/watch?v=FFtw7qW7Vcw