It's the news we've been waiting for! Ian Fleming Publications announced today (Ian Fleming's birthday) that Anthony Horowitz is currently at work on his third James Bond continuation novel due for release in May 2022. The book will be set directly after the events of The Man With The Golden Gun and will involve Bond "confronting an old enemy." It will be released in the UK by Jonathan Cape and in the U.S. by Harper Collins.
You can read the full press release at Ian Fleming Publications.