No, there isn't much to chew on. The report only shows marketshare. It says nothing about the size of the market, their methodology, nor the uncertainty in the values. This means that we don't know if the change in marketshare was significant. It also means that we don't know if it represents growth or losses for the various types of book seller. (In the cases of large changes, it is fairly evident what happened. In the cases of small changes, it is not evident.) Even if they fleshed out the data, it doesn't tell us anything about how the buying habits of individual consumers have changed (e.g. someone who bought from bookstores probably started buying ebooks) because it seems like the data relates to sales.

It's a pretty graph to look at though.