In a trailer that is filled with a mix of cinematics and gameplay alike, albeit with that watermark of "Development footage. Subject to change." it's a small look at what could be.
In the snippets of gameplay that we do see, it looks like the game is heavily influenced by Final Fantasy XV's action combat, with Cloud swinging his sword in a fashion very unlike that of traditional, turn-based JRPGs.
Watch the teaser below. The description on the video's page states that more's to come in June 2019, which presumably means E3.