All of the npc shots in the trailer are basically from afar. Why is that? There weren't even that many in the trailer to begin with? Where are the Argonians, Khajits, and Orcs?

My guess is that they simply aren't finished with the Argonian, Khajiit or Orc models yet. Bethesda has stated that they're going to be doing some major redesigns on all 3.

Did anyone see a Dunmer?

Wasn't it the same way with early footage for Oblivion?

We've seen one in an early screenshot. In that screenshot with the assassin stabbing a guy, you can tell that the guy getting stabbed (I think anyway, it may be the other way around) is a dunmer by his grayish skin.

because the games not done yet. the less you know the longer you will be excited, and the better chances they got that you will buy it right away when it comes out.

You do realize they still have several months to give us new information right? Just dropping everything at one time would be terrible marketing.

Oblivion was secretive with NPC's too if anybody remembers. I'm guessing the main character in the trailer is a Nord most likely, the guy getting stabbed in the chest looked like an Imperial possibly.