A few weeks ago, SCO announced it was "researching" use of its intellectual property. Right now, the biggest piece of the SCOsource pie is a pair of libraries that allow people to run SCO Unix applications on Linux. However, the company also claims to own "much of the core UNIX intellectual property" and has plans to "expand" its licensing activities.
SCO also has David Boies, famous for his role in the Microsoft antitrust suit, for "research and protection of SCO's patents, copyrights and other intellectual property." Since companies rarely retain lawyers of Boies' caliber for "research," you can probably expect that SCO plans to sue somebody -- the question is, who?