Very well done,
For a teaser it seems awesome and extremely well thought out, the attention to detail caught my eye mostly, though there was a few things I disliked about it.
The characters didnt seem to move very well, you maximised multiple camera angles and flicking through them quickly so as to not have to spend time in actually making things move much (so it would seem).
In parts where you actually saw people moving fully, such as the gas masked man shortly after he gets shot, it doesnt seem to flow as well as with the majority of the teaser.
Oh and it didnt seem very three dimensional, ust quickly layered.
On the whole I enjoyed it and Cant wait to see more :)
Yours~
-Paul