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.”
Considering the fact that there is already a rumour about the 18 unannounced Switch titles to be released this year which surfaced on the Amazon website(which was taken from the site a short time after), and the upcoming Nintendo Direct, the announcement of Bayonetta 3, to be released this year won’t be much of a surprise as it has already been officially announced that it will be launched for the Switch. Lets’ see if there will be a Direct this month and if there will be the game might be announced there.