I'm baffled at how uninspired the art is for the setting. A desert, a kind of moon, a jungle. Things I've already seen in ME1, 2, 3 and DA.
So you have a big new toy to play with (a new galaxy), and you can't show anything remotely original in this teaser (or trailer, in the long run I don't know anymore)? "Trees with red leaves", that's all you can show to give us the taste for exploration? A "Brute" look-a-like, that's all you found for combat?
ME is a series about "species", the unknown, with an emphasis on dialogs, story. And all they show in the trailer was "space vehicles" and very boring "landscapes".
I don't know what the purpose of the trailer was, but in any case my excitement for the game is pretty thin right now.
And I'm still really afraid the game will rely on me finding "resources" like "rocks", "plants", "relics" in "open world areas". That was bearable 2 years ago.