Dr Strange is one the craziest and most certainly wild Marvel characters being the ultimate Sorcerer Supreme. He's the start of the magical side of the Marvel universe and the trailer was a good tease of that. Below I've taken some screenshots from the first Dr Strange trailer capturing key moments from it and discussing them.
This opening shot we see Benedict Cumberbatch in his important life changing origin of when he was in a car crash and lost his steady hands. I don't know a ton about the character, but I have read up on it a bit so I'll do my best here.
I thought this scene lingered on a bit and I'm fairly sure it's Rachel McAdams which plays his nurse and a potential love interest for the film as well.
This is a bit later when he's discovering himself out in the world and it displays his shaking hands from the incident which is tragic as he once saved many lives as a surgeon.
Here's the Ancient One (Tilda Swinton) knocking Dr Strange out of his body during training so that he may begin learning of the many universes.
I believe these creatures that bend reality are the bad guys in the film, no idea what they're from and hopefully someone will enlighten me.
The final shot is of Dr Strange ascending in full costume which looks wonderful while being true to the comic design, overall the trailer didn't tell us much at all.