well, gallery origami house's next publication will be a collection of the works of yoo tae yong, who is probably best known at this point for his models in origami pro, many of which are here.
http://www.origamihouse.jp/book/original/yootaeyong/yootaeyong_e.htmlbrian chan's book is looking more and more to be going in the direction of takashi hoyjo's. though at this point, i wouldn't mind if the next book were origami fantasy 2 by kaede nakamura.