WISE Finds Few Brown Dwarfs Close to Home
...about 33 brown dwarfs reside within 26 light-years of sun. There are 211 stars within this same volume of space, so that means there are about six stars for every brown dwarf.
So that's slightly disappointing, but probably not unexpected by now.
On the plus side, nearby free-floating Jupiters are not excluded by the WISE data processing to date. It's also said to be likely that further BDs will be found later, but not in large numbers.