Here is an overview of each title, via Square Enix:
Final Fantasy IX (February 13)
Originally released in 2000, Final Fantasy IX is a thrilling tale of love, war, magic and self-discovery. Newcomers and veterans alike can experience legendary moments with Zidane, Vivi, princess Garnet and others with modern enhancements on the Xbox One, Nintendo Switch, and Windows 10, including high-definition movies and character models, auto-save functionality and more.
Final Fantasy VII (March 26)
Players can return to the beginning of the original Final Fantasy VII on Nintendo Switch and the Xbox One family of devices. Follow the epic adventure of Cloud and his allies as they get caught up in a massive struggle to stop the threat of Sephiroth and save the planet. With over 11 million units sold worldwide since its release in 1997, the title brings its groundbreaking story and gameplay with high-definition graphics, the addition of modern features such as auto-save, enemy encounter options and more.