Square Enix released on Twitter a few brief videos of Seiken Densetsu Collection, showcasing the new features introduced specifically for the Switch-bound trilogy.
First and foremost, we get to see the Screen Change Mode, that lets you change screen size and color configuration. In Seiken Densetsu: Final Fantasy Gaiden you can select Game Boy mode and Super Game Boy mode, while in Seiken Densetsu II and Seiken Densetsu III you can select different screen configurations according to what best fits your TV.
Switch版新機能①“画面切り替えモード”は、このような感じで複数の画面サイズから遊びやすいものを選んでプレイすることができます！⇒つづく#聖剣コレ pic.twitter.com/leHAhKJzN8
— 聖剣伝説 -公式- (@Seiken_PR) April 28, 2017
Secondly, the Quick Save, that lets you save anywhere, it's particularly useful in Seiken Densetsu II, where you originally were prevented from saving until you found an inn.
Switch版新機能②“クイックセーブ”宿屋を見つけないとセーブができない『聖剣伝説2」では特に、このクイックセーブ機能が活躍しそうです！こまめなセーブ、大事！！#聖剣コレ pic.twitter.com/Q0rob7arOP
— 聖剣伝説 -公式- (@Seiken_PR) April 28, 2017
Thirdly, the Music Mode, that lets you listen to the music of all three games even when you're not playing.
Switch版新機能③“ミュージックモード”ゲームをしていないときでも、ホーム画面から、3作品の楽曲を聴くことができます♪『聖剣伝説コレクション』発売まであと1ヶ月。楽しみにお待ちください！https://t.co/6oLkuvyLPR #聖剣コレ pic.twitter.com/nJdqMNbmG9
— 聖剣伝説 -公式- (@Seiken_PR) April 28, 2017
Seiken Densetsu Collection will be released in Japan on June 1st, exclusively for Nintendo Switch. It includes Seiken Densetsu: Final Fantasy Gaiden (previously published in the west as Final Fantasy Adventure), Seiken Densetsu II (published in the west as Secret of Mana) and Seiken Densetsu III, which has never been released in the west, only fan translations exist.
No western release has been announced for the moment. If you want to see more, you can check out the reveal trailer.