That trailer is amazing I love watching it over and over and just makes me even more pumped for when the game comes out!
I guess the black guy is a possible new character (Perhaps only if you lost or killed a character from the original?) Seeing as one person died regardless. (We know who they are I won't say anyway.) Also I'm wondering if Shepard is thought to have died but he survived said accident but no one knew. I got this theory from one trailer it shows the Normandy pretty damaged and he is on board, perhaps the majority of the public thought he died in it but he didn't? Also when an Assari said "Your dead" to Shepard this could be after said event but in the same trailer with the Normandy perfectly fine this could be before said event. I'm already starting to theorise, just shows how much i love the original which I do.