From what I understand,
1. Last year, an interview invitation is almost equal to an admission (see the questions they asked), but there are individuals who were admitted without an interview (similar things can be found in the FAQ section).
2.However, this year, there are 42 interviewees in Beijing, China alone (can't find official source for that), which means many would not be able to pass it even if an interview invitation is given. Oh, how considerate they are.
3. A face-to-face interview? Please be kidding.