So now it appears that I actually have to finish my book on the metaphysics of species, for it will soon be under contract with Palgrave-Macmillan in their new "New Directions in the Philosophy of Science" series. The manuscript is due in June, so I have months, but they will doubtless go by quickly. If anyone would like to read a draft manuscript, please let me know. I'll be happy to send you a link when I get the draft ready enough to bother folks with (probably in January).
I'm grateful to Steven French and the editorial board for the series for pursuing this with me. I had originally thought that I was writing one giant book on biological kinds, but then realized when they got in touch that in fact I had a book on biological species a bit closer to hand. I'd encourage anyone who's working on a book-length manuscript in the philosophy of science to get in touch with them. All signs are that this is going to be an excellent series and that Palgrave is really serious about stepping up their presence in philosophical monographs generally.