http://arxiv.org/abs/1105.3796
http://www.newscientist.com/article/mg21028154.200-when-the-multiverse-and-manyworlds-collide.html?full=true
Sean Carroll has a nice explanation of the general idea on his blog that falls somewhere between newscientist's uninformativeness and the usual layman-inaccessible arxiv article.
http://arxiv.org/abs/1105.3796
http://www.newscientist.com/article/mg21028154.200-when-the-multiverse-and-manyworlds-collide.html?full=true