2-3 weeks is just speculation, there is no confirmed date for the sat launch. This article supports the notion that this delay could in fact affect the proposed september launches. Directv may have to do some serious damage control soon:
http://www.twice.com/article/CA6448338.html
There is also articles that say the delay will have no effect on septembers channel launch.I'm more likely to belive a Directv spokesman the you !