Google announced that it has made it "easier" to choose the result you want. It's not as major as it sounds. Essentially, they just made an adjustment to how Instant Previews work. Here's the full announcement:
In addition to some recent changes to the look and feel of search, today we’re making it even easier to see Instant Previews of your search results. Sometimes you’re searching for a page with a specific type of visual - like a seating chart when you want to buy baseball tickets - but can’t tell from the results page which one will have exactly what you’re looking for. Or you’ve already seen a specific page and would recognize it in an instant if you saw it again. You can now quickly glance at a preview of the page without having to click and see if it’s the page you want.
Instant Previews have been around since last year, allowing you to click on the magnifying glass to the right of the result to see a visual overview of a page. Now these previews are no longer even a click away: if you move your mouse over a search result, arrows will appear. Hover over them to see a visual preview of that result.
Earlier this year, Google launched Instant Previews for mobile:
Then Google later added Flash support in Instant Previews.