Any new content will be announced on the What's New page!
The spare files are placeholders for possible future content. Our shopping cart software does not allow for the retroactive addition of files to a download product so I placed them in the product initially 'just-in-case'.
I will likely add a brief video on the development history of Lightroom sometime in the next week or so. Also if there is a siginificant change in a 1.1 version of Lightroom that requires a video addition, we have the capacity to add something on that.
So the answer to the question is "Maybe."