HT_Black said:
...Wasn't Issac in his mid-40's/early 50's in the last game? Why does he look like Commander Shepard all of a sudden? Is that just for the trailers, or are we going to get some sort of planet-sized retcon before long?
You did get pretty good looks at his face at the beginning/end of the game (of course, you had to have the presence of mind to move the camera at the beginning part before he put on his helmet), and he's certainly no spring chicken- taking a close look here [http://hosting11.imagecross.com/image-hosting-14/6049Dead-Space-2009-05-07-21-18-11-20.png], one can see a rather worn face and some touches of grey at the temples. I'd peg him at a solid 40 years old, at least.
The video does seem to make him a bit younger, but his hairstyle and overall facial construction look somewhat different as well, so this might be the result of a newer (higher polygon/texture-resolution) character model in the game. Given what he went through in the first game, that steely expression could hide a crazed mind singing "Yay now is fighty time, fighty time, blood blood BLOOD" over and over to itself.