Pretty much as it says,
Once I inserted the updated sd card, the Nav initialised and when I went to set up to see which version I had installed on the Discover nav, it showed various digits followed by 2016.
I assume the Nov 15 update is their idea of 2016 data, much like when most German factories return from their summer holidays they start making the "next model" year, even though it may be 2015 at the time, in this case.