The Full Metal Panic! Season 4 release date has been officially confirmed to be rescheduled for April of 2018. The fourth season of the FMP anime was originally scheduled to premiere in the fall of 2017, but the postponement by Xebec pushed the premiere back by several months. In addition, we also know that the original timeline for the Full Metal Panic! light novel series will be the basis of the story instead of the spin-off sequel FMP! Another. At the recent Anime Expo 2017, author Shoji Gatoh and light novel illustrator Shiki Douji both talked about the Full Metal Panic! Invisible Victory anime.
The anime series has been on such a long hiatus that there's almost been a full generation gap between the original fans and today's younger anime watchers. Full Metal Panic! The Second Raid originally aired in 2005, and the Full Metal Panic! light novel series, which number 12 volumes in total, was completed in 2011. Even the light novel sequel, Full Metal Panic! Another, is up to Volume 12 as of February of 2016, never mind the short story collections. As Douji puts it, she was "worried that people may have forgotten about the first few seasons" of the anime.
Regardless of naming issues, the Full Metal Panic! Season 4 release date is set for the spring of 2018, with an August 2017 interview with Gatou confirming that the first episode will air in 2018. The premiere date is April 13, 2018. The number of episodes for the fourth season have yet to be confirmed, but this article will be updated once the announcement is made.
The cast of the new FMP anime has been announced as follows.