It's been proven as an updated trailer pretty much everywhere.
You can't just fake added particles and new character models...it's a new trailer.
Granted, not much is different, but it is different.
I think Konami just wanted the trailer to pass as normal...make people think nothing has changed, because in reality, not much really did change. They just wanted a good trailer with the up-to-date graphics that will be in the final game.
But it is a new trailer nonetheless...apparently some people take Kojima's word as their Bible.
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )