When Donald Fagen, Michael McDonald and Boz Scaggs toured together as The Dukes of September in 2010 a PBS Television special was mentioned.
We think it is that same TV special that's called a DVD in this article by the same author/website.
In the article Boz Scaggs is quoted saying:
No, it was supposed to happen last June, but circumstances prohibited it.
And we get a feeling that even though a new Dukes of September tour has been said to happen in 2012, that TV/DVD thing is not.