Umm... Wasn't Big Boss older at the time of the first Metal Gear? Like, MGS4-old? Something like that? Judging by what I've seen, he was pretty old already and this picture doesn't seem like it. Besides, hasn't Kojima Productions already hinted there was more to tell about Big Boss, and the first Metal Gear doesn't exactly fit in there.
Oh, and I don't think Gray Fox looks like this - it's more like Raiden. It is also extremely unlikely they would have so similar suits (exoskeletons or whatever). That suit looks basically the same as Raiden's in MGS4. Of course we haven't seen much yet, but still. Not to say that couldn't be Gray Fox.
Anyway, I wouldn't be surprised if it was actually two games, and I also wouldn't be surprised if we got two different periods in the same game (one for Big Boss, one for Raiden). Then we can't even be sure if they are Big Boss and Raiden: would Kojima really reveal them so easily after all this hype? Besides, two periods in one game would make the game a bit short and otherwise Big Boss and Raiden are pretty hard to fit in the same game.
And you know what? I just did a calculation earlier this day that indicates this last counter will actually finish May 31 (15:00 to be more precise, if I remember correctly) instead of June 1 in the US (PDT - L.A. time - E3 time) and June 1 in Japan - actually it seems to end on June 1 only in regions in time zones eastward from GMT+1. I'm not sure if I made an error of some sort... But anyway, my calculation was based on the fact that the previous counter ended today (May 27) at 4:00. The new counter, however, was 117 hours (at least I think so) - five days minus three hours (although that three hours isn't very significant), thus bringing the finish three hours earlier. So unless I've done something terribly wrong (it's possible despite my multiple checks; please tell me if I've made an error), it will actually end much before MS's press conference - the previous day even. Or is there yet another counter after this one? Who has the code for the site (I'm not going to get all the programs I need just to check that myself, and I saw someone post it here before)? That's not to rule out the possibility of a 360 release though.
And what's with the weather of that site? Just to create the right atmosphere?