http://www.bumbershoot.org

They haven't announced the entire line up, do u think Death cab will play?

it might be a good record release show

but i doubt it

considering they played last year i dont think they will.

Nope. Here's the lineup from Rollingstone (I apologize for the caps...i just pasted it from rollingstone.com):
COMMON, TREY ANASTASIO, the NEW YORK DOLLS, ANI DIFRANCO, GARBAGE, the DONNAS, TALIB KWELI, the DECEMBERISTS, FLOGGING MOLLY, DASHBOARD CONFESSIONAL, the POSIES, BRAZILIAN GIRLS and DIGABLE PLANETS will perform at Seattle's Bumbershoot Music Festival, September 2nd to 5th.

If you're going, you should really check out Trey Anastasio. He is one of the most talented guitar players alive (I know there are much better dead ones).