Beta tester Dan Huston submitted this enhancement request (which I paraphrased and entered into BugMonitor with ID 1152):
For a particular in argument, I want to use the set of values specified in a table or query.
For a set of arguments, I want to use tuples, rows from a table with same structure as parameter list.
I want the option of immediately expanding into a static set of generated test cases or keeping the dynamic definition in a single test case row - just point to a test data group, which could be defined based on a query, etc.
For dynamic sets, every time you generate, you expand the set of values or even create a special body of code that iterates through them (but what about stable guids for the test cases?).