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Now you can easily see more content, see less of what you don’t use and have a more streamlined experience:
Click-to-expand: Each story cluster is collapsed down to one headline with the exception of the top story. When something grabs you, click nearby anywhere but the title to expand the story box. Labeled diversity: For stories you’ve expanded, you’ll see genre labels for some of the additional articles that explain why they were chosen and how they add value. For example, you might see something labeled as an “Opinion” piece or an indication that an article is “In Depth.” Multimedia and more: Within each expanded story box, you’ll find a sliding bar of videos and photos, links to related sections and easier-to-use sharing options, so you can quickly digest the sights and sounds of a news story, dig into different types of publications and share what you find interesting with one click. Personalized top stories: The Top Stories section is expanded to six or more stories from three to give you more topic diversity. The first three stories remain unpersonalized and the same as before. The rest may be personalized based on your interests. To personalize your Google News experience you can click on “Edit” under “News for you.” You can choose the “Standard Edition” if you don’t want personalization. Less is more: The default view is now the popular “One Column” (formerly “Section”) view. We merged List View into Top Stories, as described above. You can still switch to “Two Column” view, which resembles classic Google News.
For stories you’ve expanded, you’ll see genre labels for some of the additional articles that explain why they were chosen and how they add value. For example, you might see something labeled as an "Opinion" piece or an indication that an article is "In Depth."
I suspect that "opinion" is easier to spot algorithmically than, say, "depth" is, even in a limited universe that's been defined as "news", so I don't think the classification is a trivial task.