Hideki Kamiya Says Bayonetta 4 May Be Surprising
Though there is no news about Bayonetta 4, Hideki Kamiya stated that it will be a surprise if you didn't get Bayonetta 3's ending.
www.siliconera.com
At least we know Bayo 4 is a sure thing, lol. (and apparently multiple more are already in his mind, as long as they keep selling I guess)