I might do a translation later, but I suck at actually making it sound "good" in English.
So, for now, here's a very quick rundown of what the interview said (just main points)...
He mentions that they are indeed scheduled to show a trailer soon. Then he discusses the fact that this is being created for a next generation machine and, of course, that means improvements in graphics and audio. However, that's always expected and he wants to go beyond that.
Next, he mentions the whole "from Real to Natural" thing. As I said before, he notes that in previous games, when Snake was spotted, enemy soldiers would respond with a "!" above their head. He wants to move away from that and make it possible to judge an enemies reactions based entirely upon their facial expressions and body movement. Something more "natural".
Then, there is a bit more to the natural idea. He talks about the actual warzone in which this would be taking place and how it might play out. In the original games, there were always very distinct sides. However, this is a warzone and there can be both enemies and friends within the same countries fighting as well as many other nations. It seems as if sides can change. For example, if country A and B were fighting and A is considered the enemy, it is possible that country B could end up siding with country A. Basically, the stage of battle is going to be much more complex this time.
Then he talks about "psychological warfare". In the previous games, enemies who spot Snake would just run head on and fire away like mindless drones. This isn't human nature, however. Depending on how you approach the enemies (mess with them, you could say), they will respond differently. It sounds as if you could actually frighten them or simply piss them off and their responses to you will change drastically. If they are scared, for example, their ability to fight will decrease.
Then he is asked about Raiden and simply comments that he is much cooler now and you'll see his new 'maiden voyage' at TGS.
Finally, he mentions that the best way to play previous games was to approach it as a stealth mission. You didn't want to be seen. MGS4 will allow the player much more freedom in how they approach the game.
...that's about it.
