That's Miranda. She's been mentioned in a few previews. She's one of the main characters in the iPhone spinoff game, and she's modeled after and voiced by the girl from Chuck (which I've never watched, but her name is really long so it's easier to identify her that way than looking it up).
That would be Sarah Lancaster? I see some resemblance. I believe she was in the Wikipedia character list of Mass Effect, but I didn't read it, that spoils too much for my liking.
Okay, now that I've looked around on the site I found some very interesting things. There is one potential squad member, 'a convicted felon and powerful biotic known to be psychologically unstable', residing on a maximum security starship prison. That could become interesting.
Oh, and in your 'suicide mission to save humanity' you'll be working with Cerberus. That's right, the same bastards that got your unit killed on Akuze, assasinated the lower admiral, and generally conducting unforgivably inhumane experiments everywhere across the galaxy. They're the ally. Well, I didn't see that coming.
Zombiedude: I think the intention is that the game is only over when you die because of the choices you made in the storyline. Surely they won't tell you to start over after a Krogan shoots you in the face with a shotgun. What I'm hoping for is that there aren't too many ending scenarios you die in, or at least not more than there are success (read: not die) scenarios. I mean, we're long past the text adventures in which you walk into a dark forest and a monster eats you, the end.