Another day, another rumor: multiple sources are now pointing to Friday, September 20 as the launch date for the next flagship iPhone (and also that plastic iPhone that everyone has been goingon and on about). The first hint at a September 20 launch date came last week from Nikkei, a Japanese publication (along with the US and others, Japan generally receives new iPhones before they’re available in other territories). Then today, TmoNews reported that T-Mobile was blocking employee requests for vacation on September 20, 21, and 22, indicating the possibility of a major product launch.