With a small catch - "special offers", which means that the screensaver and home page carries advertising. See here: http://amzn.to/h0sDb3
Merely because a few optional offers are delivered with your Kindle. This is the power of pre-load economics, right here...
According to the blurb the reading experience is not changed so I'd expect to see full pages without advertising. This makes sense, you spend most of your time here on pages and and you want to have full focus. I suspect because of that, the Kindle is subsidized by these pre-load economics by $25 instead of a significantly higher amount.
Thoughts? Are you going to buy one?