So had my interview today. Pretty basic questions and document verification. What suprised me was there were loads of people in there for interviews. The lady told me that she will do a final review and if everything is well (she emphasized on if everything is well), I can expect to hear back in 2 to 4 weeks.
So far there have been no changes on my tracker, It still shows interview required. The waiting game continues!
If your interview is smooth and you are on the east coast, then I think it will turn out to be quick and smooth for the next steps.