Perhaps you should add some information about who you are and why you see a need for a GAN book.
I'm not the OP but I think its time someone takes the lead in writing a GAN book. GAN is to ANN, which is the most popular algo in field of "AI", if I may take the liberty to say so. GAN is to AI what hacking is to computing. Initially I thought Springer may release a special version directed on GAN's, but I don't think that will happen unless someone takes the lead.