Could've been a bit more visually fascinating. We learn a few things:
Rachel McAdams' role is not exactly clear but she's obviously a nurse working at the hospital where he's taken after his accident.
Chiwetel Ejiofor's version of Mordo looks nothing like the comic one, he looks more like a monk than a sorcerer, and carries a sword. Curious.
Strange will apparently be doing an American accent. Never heard Cumberbatch do that before. Hard to tell it was even him (unless that wasn't his voice saying he didn't believe in things like chakras. But then who else would it be?)
This will either be an origin or tell these things during flashbacks. So that thing about Marvel no longer doing origins stories is false, at least in the purest sense.
I'd say this movie will need at least 3 trailers to maximize its hype and profitability (and there's plenty of time, from the sound of things). While it was definitely better than the first Ant-Man trailer, if it doesn't totally blow my mind in the second trailer (which Ant-Man's thankfully did) I'll be a little worried.