During today's Nintendo Direct presentation, Nintendo revealed four mainline Final Fantasy titles are heading to Nintendo Switch in 2019. Final Fantasy VII, Final Fantasy IX, Final Fantasy X|X-2 Remaster, and Final Fantasy XII: The Zodiac Age are all heading to the to the platform, and this is the first time any of these Final Fantasy games have been released on a Nintendo system.
Additionally, Square Enix announced that each of these four titles will also head to Xbox One as well. Final Fantasy XV Pocket Edition HD will also be available to download for Nintendo Switch later today (and is already available for Xbox One.)
Right now, all we know is that each of these games will be available in 2019, and we'll have to stay tuned for more information on release timing and prices.