Atlus just released Etrian Odyssey IV in North America about a month ago, but game came out in Japan on July 5th, 2012. Japan will be getting a new Etrian Odyssey game this summer.
Etrian Odyssey: The Lady of Mieniam is planed for a release on June 27 for Nintendo 3DS in Japan. It is unclear if this game truly should be named Etrian Odyssey V.
There is little to no information on this new game at this time, but in the next coming months there should be a mass amount of news.