I've heard a 20 second clip that was on YouTube and was clearly real because as soon as it popped up it was taken down by request of Universal Music Group. It was DEFINITELY U2. Bono sounded smooth, sultry, different. The walloping bass was hot (but a little mindful of the style of Vertigo)and it collided in an explosion of The Edge's guitars. "The Fly, Circa 2009" would not be far off although the songs are light years apart, I am happy to say it still sounds great.
And yes, you can hear the vocals and it sounds like Bono, heavily produced smooth slick slightly soulful Bono, but definitely Bono.
If you can find the clips and hear them on youtube before Universal knocks them down, good luck.
I had it cached on my PC and replayed and then videotaped it on my digital camera. Quality is now 10x crappier (original quality was top notch), if you want to check it out, email me.
camiloj@gmail.com
P.S. if this is not allowed, um, let me know!