Interview summary
Had my interview yesterday, Honolulu DO. It mostly consists of going over your entire application question by question, and checking that the answers you give under oath match what is on your application. I was asked some more detailed information which hadn't been mentioned on the application.
The interview ended with the tests of reading, writing and civics, which were quick and painless. (One sentence to read, one sentence to write, and six questions straight from the study booklet. The interviewer stopped at six, since I answered everything correctly)