"You can't just sell an ebook . . . The retailers who actually spend time learning the technology, integrating it and accepting that it's out there are the ones who will succeed."
It does so explicitly in the cafe scene by calling out screen glare on the iPad. However, it's also more subtle. Amazon don't release demographic data for Kindle owners, but every piece of anecdata I've seen suggests that Kindle users skew older than the very young cast of this commercial, which looks like a play for a piece of Apple's territory.
"Publishing is neither printing nor distribution. It is neither paper nor e-ink. It is the creation and support of content, and the delivery of content in whatever ways are both appreciated by readers and profitable. At the moment, the industry is being buffeted by the simultaneous rise of e-books, online retailing and retail chain discounting, as well as changes to copyright policy. It must get its internal dynamics right to remain attractive against more and more home, computer and mobile entertainment."