I had my interview today (06/04) in Houston. My case wasn't an easy one because of prolonged time outside of US. On one occasion I was out of the country for 11 months. In the beginning I thought that I would not make through the interview as the officer started up front by questioning time in and out of the country and said that I would need to give him a very good explanation for my absenses. The interview took 50 minutes, he went to the supervisor twice, but a long story short he made me sign the N-400, put stamp approved, and handed me N-652 with a mark recommended for approval. Although, he mentioned that another officer would review my application as part of a standard quality control process.
Again advice from this site had helped, a turning point in the interview was when the officer requested tax transcripts for 5 years and guess what I had them ready...
Civic questions, reading/writing was very easy - nothing to worry about if you study.
Still there is a bit of uncertainty in my case, but I am optimistic, feel much better than before the interview, and look forward to my oath letter. I was told that they are now processing applications for August 15th ceremony in Houston...