Concept art was shown off as well as video of Benedict Cumberbatch.
Below you can check out YouTube user ShartimusPrime's reaction to the Marvel panel as he just exited the D23 hall.
Reddit also put together the following description:
"The comics do it all, traverse these worlds, traverse these directions, and with each film we try to expand that." He talked about Scott Derrickson, the director, and the cast including Tilda Swinton and Benedict Cumberbatch, the latter of whom sent a recorded greeting.
"I"m very lucky and excited to be playing Doctor Strange for Marvel. He's an extraordinary character and brings in whole new multiple dimensions to the Marvel Universe. It will bring a mind-blowing experience."
"You're going to get girls, cars, explosions, and a bit of astral projecting into multiple dimensions - the usual fare."
While the movie doesn't start filming until November, they brought concept art for us to see in a video.
Narration by the director says "he's the top neuro surgeon in the world, but has a car accident that mangles his hands. He goes on a quest looking for healing, looking to recover, and meets the Ancient One."
The concept art shows Strange going to the far east, then being transported to, as promised, multiple cimensions. Cars flying through the air in the city, Baron Mordo fighting him, and the full on red caped look straight out of the comics.
He's doing magic, pulling mighty magical chains, and no joke, that look was RIGHT out of the comics. Even a quick 1-second CGI shot of Strange shooting magic bolts capped it all off. Huge reaction from the crowd.
"Doctor Strange" has a November 4, 2016 release directed by Scott Derrickson.