Zeppelin Air wasn’t the first all-in-one AirPlay speaker system to be announced—that would be iHome’s less expensive iW1—but it will be the first to actually hit stores. Bowers & Wilkins has used its prior-generation, premium Zeppelin speaker as the basis for Zeppelin Air, preserving the same “oblong spheroid” elongated football shape and “floating front dock” that generated so much discussion back…