Jason passed this interesting article along to the group earlier this week.  It is worth reading the preliminary conclusions from a multi-year study of student performance.
Since the flipped classroom is still a fairly new concept, there aren't many studies that have collected empirical data on student performance.  This one may provide some of the data that supports what we have been seeing in our classes.

The Flipped Classroom Boosts Grades 5%. Why That’s As Big As We Can Expect.

Thank you for finding the article and passing it along to the group.