This review is longer than most, but the book has more ideas than most. Some ideas are introduced without elaboration.
Sometime later this century, or the next, advancing technology may render humans economically and militarily useless, except possibly for a few genetically enhanced specimens with advanced levels of creativity.
This book is a followup to the author's earlier 'Sapiens', but has more extrapolation on where humans might go. As such it is more radical and frightening, also exciting. 'Sapiens' illuminated the past, where this is a window on a possible future.