Platinum Games, Hideki Kamiya, says that he has been thinking about the way the company conveyed the ending of the recently released Bayonetta 3 presumably due to the response he has had from fans on social media. He then went on to causally mention that because of this, some players will be surprised with Bayonetta 4 and the direction the story will ultimately take. This is the first time Platinum Games has talked about a Bayonetta 4 and we can presume that Nintendo will once again be funding the project as they have the last two entries in the series. Bayonetta 3 is available now at retail and on the Nintendo Switch eShop and you can read our review here.
Kamiya already musing about Bayonetta 4

Have not seen the reviews about the game yet, but I’m planning too later today.
Counting down to Gruntilda showing up and complaining that they haven’t started development of Bayo 4.
3… 2… 1…
😂 Honestly I thought that would be the first comment. Cause they say the same thing every single time.
I wouldn’t be surprised if “Bayonetta” returns again in the fourth game’s story.
I should explain what I mean but I don’t wanna spoil anything when it comes to Bayo 3’s story.
I hope it will be for a next gen hardware. Bayo 3 was pushing it hard on Switch now
Is Bayonetta a Sega IP or Nintendo IP?
Sega/Platinum IP, and Nintendo publishes Bayo 2 & 3. But I hope for any next gen stuff, for example next Nintendo Hardware.