Ultra Instinct Goku is coming soon to the Dragon Ball FighterZ roster. That's it. We have some art for him. There's no release date nor literally anything else to share. Such is the way with a lot of these announcements from Bandai Namco.
I could look up some background information about the character, but I frankly do not care about this franchise enough, nor anime in general, to do that.
¯\_(ツ)_/¯