Paramore is a decent shout actually Andre.
QOTSA: I doubt they will headline. They subbed download. What's happened since then to warrant the step up?
Arctics: Don't think so. Personally think they will tour America heavily next summer. They did their european summer festival tour this year. And it's well documented that they don't seem too keen on the fest after 2009, so would be very odd to do a one off performance.
Arcade Fire. 4 years is not a large enough gap. Reading does not repeat headliners, they like to keep the line up fresh. This is not V festival. Will play Glastonbury and TITP
Metallica: New album out, but would seem odd to go in completely the opposite direction they did for this year's headliners. Put PJ in that category too.
I'm going for:
Mumford and Sons
I know it's appalling.