As far as we were aware, the UAW's national strike against GM stemmed from an effort to secure future work for its American plants, rather than have new products assembled in Mexico or China. But when the strike ended two days later, the UAW claimed victory with a landmark health care agreement. Talk of job security was mysteriously absent. Now it looks like there may have been a reason no one over at the union was dancing in the street for job security. The UAW's white book, which details the pending contract between GM and its laborers, lists the future of 15 plants as "demand and business case dependent." Most of the affected plants have through 2011 before production on their current product ends and workers have to start worrying about demand for their scheduled product. But four plants have no future product listed to replace their current work. While some say the phrasing is just business as usual, others believe the uncertainty will eventually be used to create competition and leverage concessions at individual plants looking to secure future work. Anyone up for another strike? [The Detroit News]