Despite its name, Final Fantasy Adventure was actually the first game in the Mana series. It was titled “Seiken Densetsu: Final Fantasy Gaiden” in Japan, in 1991, for the Game Boy. It was later released in the US, in November of that year, as “Final Fantasy Adventure”. Then, in 1993, it was re-released in Europe as “Mystic Quest”.
Applying for these trademarks could imply that Square Enix has something in the works involving Final Fantasy Adventure. It could be a remake, remaster, or new Seiken Densetsu collection—but these are all merely speculative possibilities.
Secret of Mana was remade for PC, PlayStation 4, and Vita and released in February of 2018. It was also included in the Seiken Densetsu Collection, released in 2017 for the Switch. Last year, Masaru Oyamada, the Mana series producer, also stated that he’d love to see a new Switch entry to the Mana series in the future.
We’ll continue to keep an eye on future trademark filings and other forward movement involving Secret of Mana and Square Enix.