The inner edge of the Fomalhaut debris disk is at a radial distance of only 133AU, while the Oort Cloud is hypothesized to be at 50,000AU from the Sun (almost a light-year). I gather there are real orbital stability problems at such vast distances. The Fomalhaut disk is a 'rough' equivalent of the Kuiper Belt in the Solar System, although it's a fair bit further out.
The
Australian newspaper's weekend supplement carried the story today, and it was written more in the 'advance of science' style rather than pretty much just the controversial research of two scientists. Anyway, all will be revealed soon!
Cheers -