also his cerberus, really like that too
as for a second book.. in his first book he said he has no motive to diagram his models, and the only reason he did make the book he did was for kids like him when he was younger. i quote here
"i am writing this book for kids around the world of origami. kids, which i was one of, certainly would like to fold those models like i create. to do this, they need diagrams. that's why. i myself did fold various diagrammed models which my predecesoors created, and i have learned a lot from them. i would like to give something to the people around the world of origami more then i got from them. i could not have done what i have done without them"
the second sentence and the second last sentence leeds to believe he has accomplished his goal and will have no desire/motive/need to make a second book
But I don't think he will ever diagram the wasp. It is a predominantly box-pleated model, and it's almost impossible to diagram them properly. You would be better off folding from the cp. The same goes for Ryuzin. Not only is it box-pleated, but can you imagine how many steps it will have???? LOOK AT THE HEAD! It's frikkin' complicated! He might publish the cp, which he has already drawn, but I don't think he'll make diagrams for it anytime soon.