The movie is supposedly sticking to the comic origin, where Strange travels to Asia to learn mystical powers from the Ancient One. Rather than have an Asian play the guy from Asia (!), we're getting a rich white guy travelling to Asia where a powerful white woman will teach him the secret mysteries of an Asian culture. I have to think it's a lot more offensive to write an Asian out of an Asian role, but whatever.
Angry Asian Man doesn't seem too thrilled by it...
NICE TRY, MARVEL. 'DR. STRANGE' CASTING IS STILL WHITEWASHING
TILDA SWINTON TEACHES DR. STRANGE THE MYSTICAL ASIAN STUFF