There's not much to say about Square Enix's announcement of an announcement given that the teaser is basically all about the name of the project and the date it's going to be revealed:

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It seems like we'll learn more about it on April 19th then but what can we guess from it?

Well, the trailer was uploaded on Square's Japanese channel but the text for the announcement and the description of the video is in English, so a western release is possible.

Furthermore, the logo at the end looks very Final Fantasy-like and it could be a new game set in Square's most cherished universe.

We'll let you know when Square reveals more on April 19th.

[Source]