Any changes in GMAT in past 4 years?

Hi all, I took GMAT in 2007 (720, 6/6 in AWA) and planning to write it again as I have finally gotten serious in MBA apps. I have not been following GMAT lately and wondering if there are any significant updates in the test. I still have the old…

Hi all,
I took GMAT in 2007 (720, 6/6 in AWA) and planning to write it again as I have finally gotten serious in MBA apps. I have not been following GMAT lately and wondering if there are any significant updates in the test. I still have the old official guides and took a few tests from them. I'm wondering if I need to buy newer guides or should the 4 year old books be sufficient.