If Cristina Yang (Sandra Oh) as a character has a "flaw" it's probably her overzealousness in terms of work. This has caused, among others, rifts in her relationships with people. TV Guide reports that Yang will be in the same position when Grey's Anatomy returns next year.
Says TV Guide, "If there's one thing we know about Dr. Yang, it's that her career always comes first. Has her time with Owen changed that? We'll find out when Cristina gets stuck with a very difficult decision that could drastically affect not only her future, but also one of her closest relationships."
In other words, essentially every couple on Grey's Anatomy
except Meredith (Ellen Pompeo) and Derek (Patrick Dempsey) - Alex (Justin Chambers) and Izzie (Katherine Heigl), Mark (Eric Dane) and Lexie (Chyler Leigh), Callie (Sara Ramirez) and Arizona (Jessica Capshaw) - will be in trouble when the ABC medical drama returns. So that means everything is back to normal.
But back to Yang, who is of course expected to almost always choose work over love when push comes to shove. Once or twice in the past, she had come in conflict with Owen (Kevin McKidd) when things don't go well for her professionally - when you think about it, that also explains why Teddy Altman (Kim Rayver) is in Seattle Grace in the first place. She was a "present" from Owen for then down Cristina.
Source: TV Guide(Image courtesy of ABC)