Acts now listed on the festival's site, here
There's no sign of Muse! Because they're doing V Fest, its highly unlikely they'll be doing reading.
Oh, Londoner just posted this which i thought was interesting
Today in X-FM they were talking about this, and they said MUSE were now a strong rumour. Correct me if I´m wrong but they are always very enthusiastic about Reading, they love it, and they were not ONLY in the year 2003 because they were making a new album.