According to Redditor _darth_solo, Bayonetta 3 is to be launched this year during the summer. He posted this on the Nintendo Switch subreddit and he assures that this inside information is from a reliable source. His sources have been confirmed by the moderators of r/NintendoSwitch, though he did not reveal where he got this information from.

He said “I cannot personally reveal my source, but I have it on good authority from a reliable source that Bayonetta 3 will be released this year, maybe this summer. It will not be released later than 2018 barring a disaster.

I have confirmed my sources with the mods, u/FlapSnapple gave me the go-ahead for this, so they can vouch for it. I’m sorry but I can’t say much more other than watch out for the Nintendo Direct because Bayonetta 3 will be one of those placeholder games that Nintendo is preparing to release. This direct may be Nintendo’s E3 if what we’ve heard is true.”

Source: Reddit