I do like the fact they are going with the Ultimate FF idea of the teleportation project and it makes sense the military would be interested in the technology and push the project forward.
What I don't get from this trailer is why everyone comes together. Obviously the machine is Reed's so it sort of makes sense he'd be one of the first to go through the first real application but it looks like Sue is working for the military already (which is a fairly good alteration to her character and one I'm interested to see how that works in the team dynamic) but why would Johnny and Ben be there? What aspect of this experiment do they play into?
Also, has it been absolutely confirmed Doom is a hacker? I've seen it around a number of sites but it wouldn't make any sense that Victor is a hacker and they are tracking him in one scene only for him to be part of the team the next. I could him having used the hacker alias Doom at some point in his life and that's how he came to work at the Baxter Building, again pulling from the Ultimate inspiration that the Baxter Building employs/collects brilliant youths from around the planet to push scientific boundaries.
Maybe the scene with Sue is not them looking for Victor because of him being a hacker but in the second experiment (white suits) that's where the teleportation ended up depositing everyone once they got back or that was possibly their landing site to begin with and because the trip went wrong that would account for the military cargo plane flying out to that spot or possibly bringing them back to the US.
For a teaser trailer I'm not going to write the film off yet. It definitely did a good job setting a tone for the film and the style direction we can expect it to go but there is still too much internet rumor and speculation for me to say yea or nay yet. I rather like the idea of the N-Zone and the threat coming from there (possibly with Victor's influence) vice just reusing the idea of the team and Victor coming to blows for the first time. At the least it provides an extremely credible threat that forces the public appearance of the Fantastic Four.