Last year was my first time to Reading (always been a Donnington MOR type). Had a excellent time all weekend.
Bought tickets based on Metallica announcing things (I assume it's safe to say the rest of the bill will be similar genre...)
Would be nice to see AudioSlave make an appearence as a support act. Also the rumor of U2 headlining, would be excellent (one of those bands I have never seen, but should have).