So, there's going to be another EverQuest. If you haven't heard that already, you have now. There hasn't been much released about the next iteration of the series, except that it's going to be more "open world" and "sandbox" like. Those working on it scrapped the original plan because they thought it was too much like EverQuest 2.5. Here's a recent article with SOE's Dave Georgeson concerning the game:
http://massively.joystiq.com/2013/03/25/pax-east-2013-soes-dave-georgeson-on-eq-next-and-the-future-of/