I applied SCEA to Princeton on November 3rd or so (thanks a lot, Sandy). I got the email about my interview on the 14th and had it last night, the 16th. So overall, the turnaround was quite good on their part, but maybe that's just because of how close the interviewer lived to me. As for the actual interview (if you care), I couldn't have been more pleased. The man was very friendly and the tone was quite conversational. He gave me a chance to explain any poor grades or whatnot and did, I think, an excellent job of both getting to know me and answering my questions. I can't say if it'll be the same for everyone, but if you're nervous about it, just know that if mine could go well, yours could only go better. Cheers, all.
If only you could be accepted based entirely on interviews....in fact, if only the interviews meant something.... sigh... oh well.