Clearly you're unfamiliar with Kojima's marketing. And there was plenty of real gameplay in that E3 footage.
Real gameplay as in just walking? When i talk about gameplay, i wanna see how the game plays and what fun about playing it. As for kojima marketing its never been this bad, MGS debut have alway been impressive, and this is the second E3 the game is shown, and we still have no idea about what the gameplay is like, except for walking beautiful environments it's ridiculous.