I just got done taking the revised GRE and figured maybe this would be helpful for others who are going to take this revised format.
First things first, I honestly will admit I didn't study, with the exception of taking one of the practice test on Powerprep, but after seeing preliminary scores I think I did fairly well. In comparison to the Powerprep, the test was a little harder. The verbal portion while different than before does require you to know some vocabulary, just in context though. As far as vocabulary is considered I think going over a word list from before definitely wouldn't hurt. The Powerprep verbal was far easier on the prep test I took than the actual test, so really I was caught off guard. The math portion on Powerprep was also a little easier. I had scored 800 on Powerprep, but I know I missed at least 2 questions on the math portion on the test. As far as type of questions, I would say it was mainly algebra and geometry and that's it for math and a lot of reading comprehension and complete the sentence questions on the verbal.
Secondly, where I took my test they weren't too familiar with the revised GRE, so if you have questions I would strongly advise to asking ETS not necessarily the testing center.
Thirdly, for the first few months they are giving you preliminary scores in the older format, so it should give you an idea on how you matched up to last years competition and those who have taken the old format. In November though they will be figuring out percentiles for the new format.
Overall, I think the new format will probably do a better job at accurately showing how a student will do in grad school, mainly because of the verbal portion. If anyone has questions about the test they can ask me.