Ok, I know as well as the biggest band in the world they are possibly the most disliked band in the world. I fucking love them and don't give a shit what you say. Here's why I think it's not only possible, but likely, here's why:
1. "We very much want to have a record out by the end of the year, September, October, November; that kind of time. We're working with Dangermouse who's a smart guy. He's on it; he's excited. It's a great team and feels very liberating at the moment -- anything goes. We have an abundance of riches, we could make three or four different records and justify that to ourselves, but to make the best record you can, you have to steer away from the ones you can make easily. We're really trying to get into territory that we're not comfortable in. If that makes sense..." - Adam Clayton
Mercury Records has also stated a new U2 album will come in 2013. "Mercury Records, which is U2's label in the UK, has apparently announced that U2 will release its next album in 2013. The news was reported a few hours ago in a pair of tweets by the London-based Music Week."
Mediamass.net has reported "U2 are rumoured to be planning a worldwide tour at the end of 2014. When contacted, a representative had no information on a new album, or any of the rock band’s future plans. This isn’t the first time in recent memory reports have surfaced about U2 recording sessions. Fans will be anxiously awaiting..."
So they likely will have an album out this year, and if not, towards the early part of 2013. They're working with Dangermouse, so the album will likely be stunning.
2. U2 has brought at least 2 of their US tours to the West Coast in April. Elevation Tour: Anaheim 23, 24, 26 April 2001. Vertigo Tour: Anaheim April 1, 2, Los Angeles April 5, 6 2005.
3. Bono showed up right next to the polo fields this year to support some sort of African clothing line. Do you really think he was there just for that? I don't believe it one bit that he just drove past the festival. http://www.google.com/url?sa=f&rct=j...ADdmK0MmdmFADg
The Edge scouted out Glastonbury a year before they played it, perhaps Bono was meeting with Goldenvoice, but maybe not.
4. U2 has already played Glastonbury, and never played Coachella. They're worth a lot to book and could draw a stadium sized crowd on their own. It guarantees a sell out weekend. U2 is also going to quit in the next few years, they've vocally stated they don't want to go on forever, and Bono has plenty of work to do as a lobbyist.
5. I admit, I may be wishful, but it seems more likely than ever. They are supposed to be touring Arenas rather than stadiums, so there will be no massive "claw" to haul around on this tour. I invite you to cuss me out and tell me why I'm wrong or right now.