Google shows some of the navigation links (they call them sitelinks) when the top result is the homepage of an important site. This is not new, but until now you could see only the anchor texts on one line, like this:
Now Google shows each link on a line, and includes the URL next to the link for more clarity. The result is that the first result dominates the page. This is useful if your query is general, but you want to access a more relevant page: let's say you search for Opera in order to download the browser. The first result is Opera.com, but it includes a link to the download page underneath.