It sounds like Edge has been talking about U2's future plans with Brian Hiatt of Rolling Stone, and Edge seems to be saying there's a 50/50 chance of a new U2 album (or new U2 songs in some form) in 2012. Hiatt tweeted this Edge quote a couple hours ago:
U2 2012? "It's quite likely you might hear from us next year," Edge tells me in next @Rollingstone. "But it's equally possible you won't."