Claudia Kim, also known as Kim Soo-hyun, is a Korean actress that was cast in Avengers: Age of Ultron about seven months ago. We don't report a lot of casting news (when possible), so she completely slipped my radar when doing my trailer analysis yesterday. She hasn't been rumored to be any established comic book character, but she is rumored to be a villain. Her proximity to the Avengers at their party means this rumor is either false, she becomes one later, or has been deceiving them for some time. Marvel has not been very forthcoming with any details on Kim's character. She also got no prominent screen time in the trailer, but neither did The Vision.

I've included a video of Kim in what looks like a soap opera. I'm guessing she's got great acting chops, because why else would Marvel cast her?