Is it really unrealistic for there to be an album in late 2013? That will be 4 and a half years since NLOTH, and more than 3 years since bono first mentioned the band was working with danger mouse on a new album. Given the gaps between pop, atyclb, htdaab, and nloth, 2013 seems far more likely to me than 2014.
Only other option i can see is them hitting that 'rich, songwriting vein' again in late 2013, and postponing till early 2014... which i suppose is a possibility, but given the time in and out of the studio since 2010, i don't think it would happen.