A sharp-eared passerby recorded the songs and apparently posted the songs to YouTube, according to The Sun.
Of course, they didn't stick around on YouTube very long.
The upcoming album is called "No Line On The Horizon."
While this is, of course, offbeat and funny news, it's hardly that important a leak. Assuming what's on the web is current and correct, a simple search for torrents shows quite a few with the entire album. And no, I didn't download any of them to check.
Reported by Tech Ex http://technologyexpert.blogspot.com/