In the meantime, an “Odoru Very Merry Christmas” audio drama based on the novel’s 6th volume from March 2003 has brought the series’ action to a luxury liner, and chapter six of that, “The Last Action Hero,” was published today.
Shoji Gatoh’s Full Metal Panic! is slated to come back for a fourth anime series, Invisible Victory.
The Tweet saying that it’s due in fall 2017 is still around, but the site is now a bit more ambiguous.