According to MTV Multiplayer, Konami is supposedly asking reviewers to avoid spilling details about Metal Gear Solid 4 in their reviews.
That's understandable for story details to avoid potential spoilers, but they aren't talking about story details.
They are talking about cutscene length and install times. Konami doesn't want reviews to mention these two details about MGS4. Maybe they think gamers will view them as negatives.
We already know that everyone gets into a fanboy fuss over install times on every single PS3 game like it's some big surprise. Get over it. PS3 games are going to use installs.